From e8ae8c3eac297da5986dd14c892783d0bc79fae2 Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 03:16:52 +0000
Subject: [PATCH 1/9] version1

---
 .../yahia008/student_registry-V1/Cargo.lock   |  7 ++
 .../yahia008/student_registry-V1/Cargo.toml   |  6 ++
 .../yahia008/student_registry-V1/src/grade.rs | 31 +++++++++
 .../yahia008/student_registry-V1/src/main.rs  | 43 ++++++++++++
 .../student_registry-V1/src/registry.rs       | 69 +++++++++++++++++++
 .../src/registry_struct.rs                    |  6 ++
 .../student_registry-V1/src/student_struct.rs | 42 +++++++++++
 .../yahia008/student_registry-V1/src/utils.rs |  3 +
 8 files changed, 207 insertions(+)
 create mode 100644 rust_session/yahia008/student_registry-V1/Cargo.lock
 create mode 100644 rust_session/yahia008/student_registry-V1/Cargo.toml
 create mode 100644 rust_session/yahia008/student_registry-V1/src/grade.rs
 create mode 100644 rust_session/yahia008/student_registry-V1/src/main.rs
 create mode 100644 rust_session/yahia008/student_registry-V1/src/registry.rs
 create mode 100644 rust_session/yahia008/student_registry-V1/src/registry_struct.rs
 create mode 100644 rust_session/yahia008/student_registry-V1/src/student_struct.rs
 create mode 100644 rust_session/yahia008/student_registry-V1/src/utils.rs

diff --git a/rust_session/yahia008/student_registry-V1/Cargo.lock b/rust_session/yahia008/student_registry-V1/Cargo.lock
new file mode 100644
index 00000000..25893481
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "student_registry-V1"
+version = "0.1.0"
diff --git a/rust_session/yahia008/student_registry-V1/Cargo.toml b/rust_session/yahia008/student_registry-V1/Cargo.toml
new file mode 100644
index 00000000..0eedbc73
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "student_registry-V1"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/rust_session/yahia008/student_registry-V1/src/grade.rs b/rust_session/yahia008/student_registry-V1/src/grade.rs
new file mode 100644
index 00000000..10438b1e
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/src/grade.rs
@@ -0,0 +1,31 @@
+#[derive(Debug, PartialEq)]
+pub enum Grade {
+    First,
+    Second,
+    Third,
+}
+
+impl Grade {
+    pub fn as_str(&self) -> &str {
+        match self {
+            Grade::First => "Cohort 1",
+            Grade::Second => "Cohort 2",
+            Grade::Third => "Cohort 3",
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum Sex {
+    Male,
+    Female,
+}
+
+impl Sex {
+    pub fn to_str(&self) {
+        match self {
+            Sex::Male => println!("male: 👨🏾"),
+            Sex::Female => println!("female: 👧🏾"),
+        }
+    }
+}
diff --git a/rust_session/yahia008/student_registry-V1/src/main.rs b/rust_session/yahia008/student_registry-V1/src/main.rs
new file mode 100644
index 00000000..de079fc8
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/src/main.rs
@@ -0,0 +1,43 @@
+mod grade;
+mod registry;
+mod student_struct;
+
+
+use grade::{Grade, Sex};
+use registry::Registry;
+use student_struct::Student;
+
+fn main() {
+    // let g = Grade::Second;
+    // println!("{}", g.as_str()); // "2nd Year"
+    // println!("{:?}", g);
+
+    // let ss = Student::new();
+    // println!("stund")
+
+    // let mut reg = Registry::new();
+
+    // reg.add("Victor", 20, Grade::First, 78.5);
+    // reg.add("Kosi", 22, Grade::Second, 64.0);
+    // reg.add("Yusrah", 21, Grade::First, 91.0);
+
+    // reg.list_all();]
+
+    let sex = Sex::Male;
+    println!("sex: {:?}", sex.to_str());
+
+    // let s: Student = Student::new(1, String::from("Testimony"), 16, Sex::Female, Grade::Third, 40.5);
+    let s: Student = Student::new(
+        1,
+        "Testimony".to_string(),
+        16,
+        Sex::Female,
+        Grade::Third,
+        40.5,
+    );
+    println!("student here: {:#?}", s);
+
+    println!("student id: {}", s.id);
+    println!("student name: {}", s.name);
+    println!("student age: {}", s.age);
+}
diff --git a/rust_session/yahia008/student_registry-V1/src/registry.rs b/rust_session/yahia008/student_registry-V1/src/registry.rs
new file mode 100644
index 00000000..44155080
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/src/registry.rs
@@ -0,0 +1,69 @@
+use crate::grade::{Grade, Sex};
+use crate::student_struct::Student;
+
+pub struct Registry {
+    pub students: Vec<Student>,
+    next_id: u32,
+}
+
+impl Registry {
+    pub fn add(&mut self, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) {
+        let id = self.next_id;
+        let student = Student::new(id, name.to_string(), age, sex, grade, score);
+        println!("Added: {} (ID {})", student.name, student.id);
+        self.students.push(student);
+        self.next_id += 1;
+    }
+
+    pub fn list_all(&self) {
+        if self.students.is_empty() {
+            println!("  (no students enrolled yet)");
+            return;
+        }
+        println!(
+            "  {:>5}  {:<20}  {:<6}  {:<10}  {}",
+            "ID", "Name", "Age", "Grade", "Score"
+        );
+        println!("  {}", "-".repeat(55));
+        for student in &self.students {
+            println!(
+                "  {:>5}  {:<20}  {:>6}  {:<10}  {:.1}",
+                student.id,
+                student.name,
+                student.age,
+                student.grade.as_str(),
+                student.score,
+            );
+        }
+    }
+
+
+    
+    pub fn find_by_id(&mut self, id: u8) -> Option<&mut Student> {
+        self.students.iter().find(|student| student.id == id)
+    }
+
+    pub fn update(&mut self, id:u8, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) -> Option<&mut Student> {
+        if let Some(student) = self.find_by_id_mut(id) {
+        student.name = name.to_string();
+        student.age = age;
+        student.sex = sex;
+        student.grade = grade;
+        student.score = score;
+        Some(student)
+    } else {
+        None
+    }
+    }
+
+     pub fn delete(&mut self, id: u8) -> Option<Student> {
+        let position = self.students.iter().position(|student| student.id == id);
+        
+        match position {
+            Some(index) => Some(self.students.remove(index)),
+            None => None,
+        }
+    }
+
+    
+}
diff --git a/rust_session/yahia008/student_registry-V1/src/registry_struct.rs b/rust_session/yahia008/student_registry-V1/src/registry_struct.rs
new file mode 100644
index 00000000..8b076a03
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/src/registry_struct.rs
@@ -0,0 +1,6 @@
+use crate::student_struct;
+
+pub struct Registry {
+    students: Vec<student_struct::Student>, // Vec<Student> = "a list of Student values"
+    next_id: u32,           // auto-increment counter for IDs
+}
\ No newline at end of file
diff --git a/rust_session/yahia008/student_registry-V1/src/student_struct.rs b/rust_session/yahia008/student_registry-V1/src/student_struct.rs
new file mode 100644
index 00000000..9e4ead64
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/src/student_struct.rs
@@ -0,0 +1,42 @@
+use crate::grade::{Grade, Sex};
+
+// A struct groups related pieces of data under one name.
+// Think of it as a custom data type you design yourself.
+
+#[derive(Debug)]
+pub struct Student {
+    pub id: u32,      // u32  = unsigned 32-bit integer (no negatives)
+    pub name: String, // String = heap-allocated, growable text
+    pub age: u8,
+    pub sex: Sex,
+    pub grade: Grade, // our own enum type from above
+    pub score: f32,
+}
+
+// This is the implementation of the student struct with its corresponding methods
+impl Student {
+    pub fn new(id: u32, name: String, age: u8, sex: Sex, grade: Grade, score: f32) -> Student {
+        Student {
+            id,
+            name,
+            age,
+            sex,
+            grade,
+            score,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum Status {
+    Pending,
+    Ongoing,
+    Completed,
+}
+
+pub struct Todo {
+    id: u8,
+    title: String,
+    description: String,
+    status: Status,
+}
diff --git a/rust_session/yahia008/student_registry-V1/src/utils.rs b/rust_session/yahia008/student_registry-V1/src/utils.rs
new file mode 100644
index 00000000..006e5e9d
--- /dev/null
+++ b/rust_session/yahia008/student_registry-V1/src/utils.rs
@@ -0,0 +1,3 @@
+pub find_id(&self, id:u8)-> Option<&self> {
+     self.students.iter().find(|u| u.id == id)
+}
\ No newline at end of file

From 20902da1b3638e91926a81dff8d49466d315e5ef Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 03:23:48 +0000
Subject: [PATCH 2/9] version1

---
 .../yahia008/student_registry-V1/src/registry.rs       | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/rust_session/yahia008/student_registry-V1/src/registry.rs b/rust_session/yahia008/student_registry-V1/src/registry.rs
index 44155080..95a7c040 100644
--- a/rust_session/yahia008/student_registry-V1/src/registry.rs
+++ b/rust_session/yahia008/student_registry-V1/src/registry.rs
@@ -39,12 +39,12 @@ impl Registry {
 
 
     
-    pub fn find_by_id(&mut self, id: u8) -> Option<&mut Student> {
-        self.students.iter().find(|student| student.id == id)
+    pub fn find_by_id(&mut self, id: u32) -> Option<&mut Student> {
+          self.students.iter_mut().find(|student| student.id == id)
     }
 
-    pub fn update(&mut self, id:u8, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) -> Option<&mut Student> {
-        if let Some(student) = self.find_by_id_mut(id) {
+    pub fn update(&mut self, id:u32, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) -> Option<&mut Student> {
+        if let Some(student) = self.find_by_id(id) {
         student.name = name.to_string();
         student.age = age;
         student.sex = sex;
@@ -56,7 +56,7 @@ impl Registry {
     }
     }
 
-     pub fn delete(&mut self, id: u8) -> Option<Student> {
+     pub fn delete(&mut self, id: u32) -> Option<Student> {
         let position = self.students.iter().position(|student| student.id == id);
         
         match position {

From 12815bf383b1ca241530593f7d8a20d98dbfb91d Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 09:08:33 +0000
Subject: [PATCH 3/9] version1

---
 .../yahia008/student_registry-V1/src/main.rs  | 68 ++++++++++---------
 .../student_registry-V1/src/registry.rs       |  2 +-
 2 files changed, 37 insertions(+), 33 deletions(-)

diff --git a/rust_session/yahia008/student_registry-V1/src/main.rs b/rust_session/yahia008/student_registry-V1/src/main.rs
index de079fc8..18634ee5 100644
--- a/rust_session/yahia008/student_registry-V1/src/main.rs
+++ b/rust_session/yahia008/student_registry-V1/src/main.rs
@@ -8,36 +8,40 @@ use registry::Registry;
 use student_struct::Student;
 
 fn main() {
-    // let g = Grade::Second;
-    // println!("{}", g.as_str()); // "2nd Year"
-    // println!("{:?}", g);
-
-    // let ss = Student::new();
-    // println!("stund")
-
-    // let mut reg = Registry::new();
-
-    // reg.add("Victor", 20, Grade::First, 78.5);
-    // reg.add("Kosi", 22, Grade::Second, 64.0);
-    // reg.add("Yusrah", 21, Grade::First, 91.0);
-
-    // reg.list_all();]
-
-    let sex = Sex::Male;
-    println!("sex: {:?}", sex.to_str());
-
-    // let s: Student = Student::new(1, String::from("Testimony"), 16, Sex::Female, Grade::Third, 40.5);
-    let s: Student = Student::new(
-        1,
-        "Testimony".to_string(),
-        16,
-        Sex::Female,
-        Grade::Third,
-        40.5,
-    );
-    println!("student here: {:#?}", s);
-
-    println!("student id: {}", s.id);
-    println!("student name: {}", s.name);
-    println!("student age: {}", s.age);
+   let mut registry = Registry {
+        students: Vec::new(),
+        next_id: 0, 
+    };
+
+    registry.add("yusrah", 20, Sex::Female, Grade::First, 85.5);
+    registry.add("Dave", 22, Sex::Male, Grade::Second, 92.0);
+    registry.add("basongs", 19, Sex::Male, Grade::Third, 78.5);
+
+    println!("\nAll students:");
+    registry.list_all();
+
+
+    println!("\nUpdating student with ID 1...");
+    if let Some(student) = registry.update(0, "jiggs", 21, Sex::Male, Grade::Second, 88.0) {
+        println!("Updated: {} (ID {})", student.name, student.id);
+    } else {
+        println!("Student not found");
+    }
+
+     println!("\nAfter update:");
+    registry.list_all();
+
+    println!("\nFinding student with ID 2...");
+    if let Some(student) = registry.find_by_id(2) {
+        println!("Found: {} (ID {}, Age: {})", student.name, student.id, student.age);
+    }
+    
+    println!("\nDeleting student with ID 2...");
+    if let Some(deleted) = registry.delete(2) {
+        println!("Deleted: {} (ID {})", deleted.name, deleted.id);
+    }
+
+    println!("\nAfter deletion:");
+    registry.list_all();
+
 }
diff --git a/rust_session/yahia008/student_registry-V1/src/registry.rs b/rust_session/yahia008/student_registry-V1/src/registry.rs
index 95a7c040..a6b6e155 100644
--- a/rust_session/yahia008/student_registry-V1/src/registry.rs
+++ b/rust_session/yahia008/student_registry-V1/src/registry.rs
@@ -3,7 +3,7 @@ use crate::student_struct::Student;
 
 pub struct Registry {
     pub students: Vec<Student>,
-    next_id: u32,
+    pub next_id: u32,
 }
 
 impl Registry {

From 1a541b5575e7e70ca052b20f857e7f6f1bbae75c Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 10:14:05 +0000
Subject: [PATCH 4/9] version2

---
 .../yahia008/student_registry_v2/.gitignore   |   1 +
 .../yahia008/student_registry_v2/Cargo.lock   | 500 ++++++++++++++++++
 .../yahia008/student_registry_v2/Cargo.toml   |   7 +
 .../yahia008/student_registry_v2/src/grade.rs |  31 ++
 .../yahia008/student_registry_v2/src/main.rs  |  61 +++
 .../student_registry_v2/src/registry.rs       | 116 ++++
 .../src/registry_struct.rs                    |   7 +
 .../student_registry_v2/src/student_struct.rs |  42 ++
 8 files changed, 765 insertions(+)
 create mode 100644 rust_session/yahia008/student_registry_v2/.gitignore
 create mode 100644 rust_session/yahia008/student_registry_v2/Cargo.lock
 create mode 100644 rust_session/yahia008/student_registry_v2/Cargo.toml
 create mode 100644 rust_session/yahia008/student_registry_v2/src/grade.rs
 create mode 100644 rust_session/yahia008/student_registry_v2/src/main.rs
 create mode 100644 rust_session/yahia008/student_registry_v2/src/registry.rs
 create mode 100644 rust_session/yahia008/student_registry_v2/src/registry_struct.rs
 create mode 100644 rust_session/yahia008/student_registry_v2/src/student_struct.rs

diff --git a/rust_session/yahia008/student_registry_v2/.gitignore b/rust_session/yahia008/student_registry_v2/.gitignore
new file mode 100644
index 00000000..9f970225
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/.gitignore
@@ -0,0 +1 @@
+target/
\ No newline at end of file
diff --git a/rust_session/yahia008/student_registry_v2/Cargo.lock b/rust_session/yahia008/student_registry_v2/Cargo.lock
new file mode 100644
index 00000000..a4be051f
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/Cargo.lock
@@ -0,0 +1,500 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "anyhow"
+version = "1.0.102"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+
+[[package]]
+name = "bitflags"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4388bee8683e3d04af747c73422af53102d2bd24d9eadb6cbc100baef4b43f8"
+
+[[package]]
+name = "bumpalo"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72f5acc6cb2ba439de613abc23857ec3d78374d8ed5ac84e9d11336e87da8649"
+
+[[package]]
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+
+[[package]]
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+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+checksum = "037711b3d59c33004d3856fbdc83b99d4ff37a24768fa1be9ce3538a1cde4393"
+
+[[package]]
+name = "futures-util"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "389ca41296e6190b48053de0321d02a77f32f8a5d2461dd38762c0593805c6d6"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "pin-project-lite",
+ "slab",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasip2",
+ "wasip3",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.15.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
+dependencies = [
+ "foldhash",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.17.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
+
+[[package]]
+name = "heck"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
+[[package]]
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+
+[[package]]
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+checksum = "d466e9454f08e4a911e14806c24e16fba1b4c121d1ea474396f396069cf949d9"
+dependencies = [
+ "equivalent",
+ "hashbrown 0.17.1",
+ "serde",
+ "serde_core",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
+[[package]]
+name = "js-sys"
+version = "0.3.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2025f20d7a4fa7785846e7b63d10a76d3f1cee98ee5cb79ea59703f95e42162"
+dependencies = [
+ "cfg-if",
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+ "wasmparser",
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diff --git a/rust_session/yahia008/student_registry_v2/Cargo.toml b/rust_session/yahia008/student_registry_v2/Cargo.toml
new file mode 100644
index 00000000..6f08d669
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "student_registry_v2"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+uuid = {version ="1", features = ["v4"]}
\ No newline at end of file
diff --git a/rust_session/yahia008/student_registry_v2/src/grade.rs b/rust_session/yahia008/student_registry_v2/src/grade.rs
new file mode 100644
index 00000000..10438b1e
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/src/grade.rs
@@ -0,0 +1,31 @@
+#[derive(Debug, PartialEq)]
+pub enum Grade {
+    First,
+    Second,
+    Third,
+}
+
+impl Grade {
+    pub fn as_str(&self) -> &str {
+        match self {
+            Grade::First => "Cohort 1",
+            Grade::Second => "Cohort 2",
+            Grade::Third => "Cohort 3",
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum Sex {
+    Male,
+    Female,
+}
+
+impl Sex {
+    pub fn to_str(&self) {
+        match self {
+            Sex::Male => println!("male: 👨🏾"),
+            Sex::Female => println!("female: 👧🏾"),
+        }
+    }
+}
diff --git a/rust_session/yahia008/student_registry_v2/src/main.rs b/rust_session/yahia008/student_registry_v2/src/main.rs
new file mode 100644
index 00000000..d5dc0213
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/src/main.rs
@@ -0,0 +1,61 @@
+mod grade;
+mod registry;
+mod student_struct;
+
+
+use grade::{Grade, Sex};
+use registry::Registry;
+use student_struct::Student;
+use uuid::Uuid;
+fn main() {
+   let mut registry = Registry {
+        students: Vec::new(),
+        
+    };
+
+    registry.add("yusrah", 20, Sex::Female, Grade::First, 85.5);
+    registry.add("Dave", 22, Sex::Male, Grade::Second, 92.0);
+    registry.add("basongs", 19, Sex::Male, Grade::Third, 78.5);
+
+    println!("\nAll students:");
+    registry.list_all();
+
+    let first_student_id = registry.students[0].id;
+    
+    
+    println!("\nUpdating student with ID {}...", first_student_id);
+    if let Some(student) = registry.update(first_student_id, "pragon", 16, Sex::Female, Grade::Second, 88.0) {
+        println!("Updated: {} (ID {})", student.name, student.id);
+    } else {
+        println!("Student not found");
+    }
+
+    println!("\nAfter update:");
+    registry.list_all();
+
+    println!("\nFinding student by ID...");
+    if let Some(student) = registry.find_by_id(first_student_id) {
+        println!("Found: {} (ID {}, Age: {})", student.name, student.id, student.age);
+    }
+
+    let second_student_id = registry.students[1].id;
+    println!("\nDeleting student with ID {}...", second_student_id);
+    if let Some(deleted) = registry.delete(second_student_id) {
+        println!("Deleted: {} (ID {})", deleted.name, deleted.id);
+    }
+
+    
+    println!("\nAfter deletion:");
+    registry.list_all();
+
+    let specific_uuid = Uuid::new_v4(); 
+    println!("\nTrying to find non-existent student with UUID {}...", specific_uuid);
+    if let Some(student) = registry.find_by_id(specific_uuid) {
+        println!("Found: {}", student.name);
+    } else {
+        println!("No student found with that UUID");
+    }
+    
+
+
+}
\ No newline at end of file
diff --git a/rust_session/yahia008/student_registry_v2/src/registry.rs b/rust_session/yahia008/student_registry_v2/src/registry.rs
new file mode 100644
index 00000000..c55da869
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/src/registry.rs
@@ -0,0 +1,116 @@
+use crate::grade::{Grade, Sex};
+use crate::student_struct::Student;
+use uuid::Uuid;
+
+pub struct Registry {
+    pub students: Vec<Student>,
+    
+}
+
+impl Registry {
+    pub fn add(&mut self, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) {
+        let student = Student::new(name.to_string(), age, sex, grade, score);
+        println!("Added: {} (ID {})", student.name, student.id);
+        self.students.push(student);
+        
+    }
+
+    pub fn list_all(&self) {
+        if self.students.is_empty() {
+            println!("  (no students enrolled yet)");
+            return;
+        }
+        println!(
+            "  {:>5}  {:<20}  {:<6}  {:<10}  {}",
+            "ID", "Name", "Age", "Grade", "Score"
+        );
+        println!("  {}", "-".repeat(55));
+        for student in &self.students {
+            println!(
+                "  {:>5}  {:<20}  {:>6}  {:<10}  {:.1}",
+                student.id,
+                student.name,
+                student.age,
+                student.grade.as_str(),
+                student.score,
+            );
+        }
+    }
+
+
+    
+    pub fn find_by_id(&mut self, id:Uuid) -> Option<&mut Student> {
+          self.students.iter_mut().find(|student| student.id == id)
+    }
+
+    pub fn update(&mut self, id:Uuid, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) -> Option<&mut Student> {
+        if let Some(student) = self.find_by_id(id) {
+        student.name = name.to_string();
+        student.age = age;
+        student.sex = sex;
+        student.grade = grade;
+        student.score = score;
+        Some(student)
+    } else {
+        None
+    }
+    }
+
+
+    pub fn update_age(&mut self, id: Uuid, new_age: u8) -> Option<()> {
+        if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            student.age = new_age;
+            println!("Updated age for student ID {}", id);
+            Some(())
+        } else {
+            println!("Student with ID {} not found", id);
+            None
+        }
+    }
+
+    pub fn update_name(&mut self, id: Uuid, new_name: String) -> Option<()> {
+        if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            student.name = new_name;
+            println!("Updated name for student ID {}", id);
+            Some(())
+        } else {
+            println!("Student with ID {} not found", id);
+            None
+        }
+    }
+
+    #[allow(dead_code)]
+    pub fn update_sex(&mut self, id: Uuid, new_sex: Sex) -> Option<()> {
+        if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            student.sex = new_sex;
+            println!("Updated sex for student ID {}", id);
+            Some(())
+        } else {
+            println!("Student with ID {} not found", id);
+            None
+        }
+    }
+
+    #[allow(dead_code)]
+    pub fn update_grade(&mut self, id: Uuid, new_grade: Grade) -> Option<()> {
+        if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            student.grade = new_grade;
+            println!("Updated grade for student ID {}", id);
+            Some(())
+        } else {
+            println!("Student with ID {} not found", id);
+            None
+        }
+    }
+
+     pub fn delete(&mut self, id: Uuid) -> Option<Student> {
+        let position = self.students.iter().position(|student| student.id == id);
+        
+        match position {
+            Some(index) => Some(self.students.remove(index)),
+            None => None,
+        }
+    }
+
+    
+}
diff --git a/rust_session/yahia008/student_registry_v2/src/registry_struct.rs b/rust_session/yahia008/student_registry_v2/src/registry_struct.rs
new file mode 100644
index 00000000..5bca0b02
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/src/registry_struct.rs
@@ -0,0 +1,7 @@
+use crate::student_struct;
+use uuid::Uuid;
+
+pub struct Registry {
+    students: Vec<student_struct::Student>, // Vec<Student> = "a list of Student values"
+               // auto-increment counter for IDs
+}
\ No newline at end of file
diff --git a/rust_session/yahia008/student_registry_v2/src/student_struct.rs b/rust_session/yahia008/student_registry_v2/src/student_struct.rs
new file mode 100644
index 00000000..06070ea8
--- /dev/null
+++ b/rust_session/yahia008/student_registry_v2/src/student_struct.rs
@@ -0,0 +1,42 @@
+use crate::grade::{Grade, Sex};
+use uuid::Uuid;
+// A struct groups related pieces of data under one name.
+// Think of it as a custom data type you design yourself.
+
+#[derive(Debug)]
+pub struct Student {
+    pub id: Uuid,      // u32  = unsigned 32-bit integer (no negatives)
+    pub name: String, // String = heap-allocated, growable text
+    pub age: u8,
+    pub sex: Sex,
+    pub grade: Grade, // our own enum type from above
+    pub score: f32,
+}
+
+// This is the implementation of the student struct with its corresponding methods
+impl Student {
+    pub fn new(  name: String, age: u8, sex: Sex, grade: Grade, score: f32) -> Student {
+        Student {
+            id:Uuid::new_v4(),
+            name,
+            age,
+            sex,
+            grade,
+            score,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum Status {
+    Pending,
+    Ongoing,
+    Completed,
+}
+
+pub struct Todo {
+    id: u8,
+    title: String,
+    description: String,
+    status: Status,
+}

From 91b78a7e07ab15140c6f91c35c78aa62e112caf1 Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 11:20:01 +0000
Subject: [PATCH 5/9] version update

---
 .../yahia008/student_registry_v2/src/main.rs      | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/rust_session/yahia008/student_registry_v2/src/main.rs b/rust_session/yahia008/student_registry_v2/src/main.rs
index d5dc0213..1d26f9bb 100644
--- a/rust_session/yahia008/student_registry_v2/src/main.rs
+++ b/rust_session/yahia008/student_registry_v2/src/main.rs
@@ -21,6 +21,11 @@ fn main() {
     registry.list_all();
 
     let first_student_id = registry.students[0].id;
+    let second_student_id = registry.students[1].id;
+    let third_student_id = registry.students[2].id;
+
+    
+
     
     
     println!("\nUpdating student with ID {}...", first_student_id);
@@ -33,12 +38,20 @@ fn main() {
     println!("\nAfter update:");
     registry.list_all();
 
+    println!("\nMaking multiple updates to first_student:");
+    registry.update_name(first_student_id, "sami".to_string());
+    registry.update_age(first_student_id, 32);
+    registry.update_grade(first_student_id, Grade::Third);
+    
+    println!("\nAfter multiple updates:");
+    registry.list_all();
+
     println!("\nFinding student by ID...");
     if let Some(student) = registry.find_by_id(first_student_id) {
         println!("Found: {} (ID {}, Age: {})", student.name, student.id, student.age);
     }
 
-    let second_student_id = registry.students[1].id;
+    
     println!("\nDeleting student with ID {}...", second_student_id);
     if let Some(deleted) = registry.delete(second_student_id) {
         println!("Deleted: {} (ID {})", deleted.name, deleted.id);

From 734ee85e160d25592a8c7a524777ad6faf418249 Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 12:25:25 +0000
Subject: [PATCH 6/9] update

---
 .../student_registry_v2/src/registry.rs       | 28 +++++++++++++++----
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/rust_session/yahia008/student_registry_v2/src/registry.rs b/rust_session/yahia008/student_registry_v2/src/registry.rs
index c55da869..ce28f047 100644
--- a/rust_session/yahia008/student_registry_v2/src/registry.rs
+++ b/rust_session/yahia008/student_registry_v2/src/registry.rs
@@ -59,9 +59,14 @@ impl Registry {
 
     pub fn update_age(&mut self, id: Uuid, new_age: u8) -> Option<()> {
         if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            if student.age == new_age {
+            println!("Name is already '{}', no update needed", student.age);
+            return Some(());  
+        } else {
+            println!("Updated age from '{}' to '{}'", student.age, new_age);
             student.age = new_age;
-            println!("Updated age for student ID {}", id);
-            Some(())
+            return Some(());
+        }
         } else {
             println!("Student with ID {} not found", id);
             None
@@ -70,9 +75,15 @@ impl Registry {
 
     pub fn update_name(&mut self, id: Uuid, new_name: String) -> Option<()> {
         if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            if student.name == new_name {
+            println!("Name is already '{}', no update needed", student.name);
+           return Some(());
+        } else {
+            println!("Updated name from '{}' to '{}'", student.name, new_name);
             student.name = new_name;
-            println!("Updated name for student ID {}", id);
-            Some(())
+            return Some(());
+        }
+           
         } else {
             println!("Student with ID {} not found", id);
             None
@@ -94,9 +105,14 @@ impl Registry {
     #[allow(dead_code)]
     pub fn update_grade(&mut self, id: Uuid, new_grade: Grade) -> Option<()> {
         if let Some(student) = self.students.iter_mut().find(|s| s.id == id) {
+            if student.grade == new_grade {
+            println!("Grade is already , no update needed");
+            return Some(());  
+        } else {
+            println!("Updated grade from  to '{:?}'", new_grade);
             student.grade = new_grade;
-            println!("Updated grade for student ID {}", id);
-            Some(())
+            return Some(());
+        }
         } else {
             println!("Student with ID {} not found", id);
             None

From 490c58af8a77b51e346c07d19eb42b70fb7d1968 Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Wed, 10 Jun 2026 13:40:53 +0000
Subject: [PATCH 7/9] update

---
 .../student_registry_v2/src/registry.rs       | 34 +++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/rust_session/yahia008/student_registry_v2/src/registry.rs b/rust_session/yahia008/student_registry_v2/src/registry.rs
index ce28f047..c3733ef4 100644
--- a/rust_session/yahia008/student_registry_v2/src/registry.rs
+++ b/rust_session/yahia008/student_registry_v2/src/registry.rs
@@ -9,10 +9,40 @@ pub struct Registry {
 
 impl Registry {
     pub fn add(&mut self, name: &str, age: u8, sex: Sex, grade: Grade, score: f32) {
+
+        if name.trim().is_empty() {
+        println!("Name cannot be empty");
+    }
+
+     if name.len() < 2 {
+        println!("Name must be at least 2 characters long");
+    }
+    
+    if name.len() > 50 {
+        println!("Name cannot exceed 50 characters");
+    }
+    
+    if age < 18 {
+        println!("Student must be at least 18 years old");
+    }
+    
+    if age > 100 {
+        println!("Age cannot exceed 100 years");
+    }
+    
+    
+    if score < 0.0 {
+        println!("Score cannot be negative");
+    }
+    
+    if score > 100.0 {
+        println!("Score cannot exceed 100");
+    }
+
+
         let student = Student::new(name.to_string(), age, sex, grade, score);
         println!("Added: {} (ID {})", student.name, student.id);
-        self.students.push(student);
-        
+        self.students.push(student);  
     }
 
     pub fn list_all(&self) {

From a9cbef924886907a953a17891d544a59b7e97b94 Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Thu, 11 Jun 2026 11:36:14 +0000
Subject: [PATCH 8/9] push

---
 rust_session/yahia008/minilib/Cargo.lock     |   7 ++
 rust_session/yahia008/minilib/Cargo.toml     |   6 ++
 rust_session/yahia008/minilib/src/library.rs | 106 +++++++++++++++++++
 rust_session/yahia008/minilib/src/main.rs    |  32 ++++++
 rust_session/yahia008/minilib/src/member.rs  |  25 +++++
 5 files changed, 176 insertions(+)
 create mode 100644 rust_session/yahia008/minilib/Cargo.lock
 create mode 100644 rust_session/yahia008/minilib/Cargo.toml
 create mode 100644 rust_session/yahia008/minilib/src/library.rs
 create mode 100644 rust_session/yahia008/minilib/src/main.rs
 create mode 100644 rust_session/yahia008/minilib/src/member.rs

diff --git a/rust_session/yahia008/minilib/Cargo.lock b/rust_session/yahia008/minilib/Cargo.lock
new file mode 100644
index 00000000..6a1dc09d
--- /dev/null
+++ b/rust_session/yahia008/minilib/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "minilib"
+version = "0.1.0"
diff --git a/rust_session/yahia008/minilib/Cargo.toml b/rust_session/yahia008/minilib/Cargo.toml
new file mode 100644
index 00000000..60907256
--- /dev/null
+++ b/rust_session/yahia008/minilib/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "minilib"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/rust_session/yahia008/minilib/src/library.rs b/rust_session/yahia008/minilib/src/library.rs
new file mode 100644
index 00000000..d3d11a0d
--- /dev/null
+++ b/rust_session/yahia008/minilib/src/library.rs
@@ -0,0 +1,106 @@
+use crate::member::Member;
+
+#[derive(Debug, Clone)]
+pub struct Book {
+    pub title: String,
+    pub author: String,
+    pub available: bool,
+}
+
+#[derive(Debug)]
+pub struct Library {
+    pub books: Vec<Book>,
+}
+
+impl Library {
+    pub fn new() -> Self {
+        Library { books: Vec::new() }
+    }
+
+
+    pub fn add_book(&mut self, title: String, author: String, available: bool) {
+        let new_book = Book {
+            title,
+            author,
+            available,
+        };
+        self.books.push(new_book);
+        println!("✅ Book added successfully!");
+    }
+
+
+    pub fn list_books(&self) {
+        if self.books.is_empty() {
+            println!("📚 No books in the library yet!");
+            return;
+        }
+        
+        println!("\n📚 Library Collection:");
+        println!("{:<30} {:<25} {:<10}", "Title", "Author", "Available");
+        println!("{}", "-".repeat(65));
+        
+        for book in &self.books {
+            println!(
+                "{:<30} {:<25} {:<10}",
+                book.title,
+                book.author,
+                if book.available { "Yes" } else { "No" }
+            );
+        }
+    }
+
+    pub fn search_by_title(&self, title: &str) -> Option<&Book> {
+        self.books.iter().find(|book| book.title == title)
+    }
+
+    
+    pub fn search_by_author(&self, author: &str) -> Vec<&Book> {
+        self.books.iter().filter(|book| book.author == author).collect()
+    }
+
+    
+    pub fn checkout_book(&mut self, title: &str, member: &mut Member) -> bool {
+        if let Some(book) = self.books.iter_mut().find(|book| book.title == title) {
+            if book.available {
+                book.available = false;
+                member.borrowed_books.push(book.title.clone());
+                println!("✅ '{}' has been checked out by {}", title, member.name);
+                return true;
+            } else {
+                println!("❌ '{}' is already checked out!", title);
+                return false;
+            }
+        }
+        println!("❌ Book '{}' not found!", title);
+        false
+    }
+
+    
+    pub fn return_book(&mut self, title: &str, member: &mut Member) -> bool {
+        if let Some(book) = self.books.iter_mut().find(|book| book.title == title) {
+            if !book.available {
+                book.available = true;
+                member.borrowed_books.retain(|b| b != title);
+                println!("✅ '{}' has been returned by {}", title, member.name);
+                return true;
+            } else {
+                println!("❌ '{}' wasn't checked out!", title);
+                return false;
+            }
+        }
+        println!("❌ Book '{}' not found!", title);
+        false
+    }
+
+    
+    pub fn display_book_info(&self, title: &str) {
+        if let Some(book) = self.search_by_title(title) {
+            println!("\n📖 Book Details:");
+            println!("  Title:     {}", book.title);
+            println!("  Author:    {}", book.author);
+            println!("  Status:    {}", if book.available { "Available" } else { "Checked Out" });
+        } else {
+            println!("❌ Book '{}' not found!", title);
+        }
+    }
+}
\ No newline at end of file
diff --git a/rust_session/yahia008/minilib/src/main.rs b/rust_session/yahia008/minilib/src/main.rs
new file mode 100644
index 00000000..23a2a1a0
--- /dev/null
+++ b/rust_session/yahia008/minilib/src/main.rs
@@ -0,0 +1,32 @@
+mod library;
+mod member;
+
+use library::Library;
+use member::Member;
+
+fn main() {
+  let mut library = Library::new();
+  let mut member = Member::new("rasputin".to_string());  
+
+    library.add_book("48 laws of power".to_string(), "robert green".to_string(), true);
+    library.add_book("meditation".to_string(), "Machiavelli".to_string(), true);
+    library.add_book("thing fall apart".to_string(), "Chinua Achebe".to_string(), true);
+    library.add_book("romeo an julliet".to_string(), "William Shakespeare".to_string(), false);
+
+
+    library.list_books();
+
+    println!("\n--- Searching for 'Rust in Action' ---");
+    if let Some(book) = library.search_by_title("meditation") {
+        println!("Found: {} by {}", book.title, book.author);
+    }
+
+    println!("\n--- Searching for books by 'Machiavelli' ---");
+    let books = library.search_by_author("Machiavelli");
+    for book in books {
+        println!("Found: {}", book.title);
+    }
+    
+    
+
+}
\ No newline at end of file
diff --git a/rust_session/yahia008/minilib/src/member.rs b/rust_session/yahia008/minilib/src/member.rs
new file mode 100644
index 00000000..b5ac1331
--- /dev/null
+++ b/rust_session/yahia008/minilib/src/member.rs
@@ -0,0 +1,25 @@
+#[derive(Debug)]
+pub struct Member {
+    pub name: String,
+    pub borrowed_books: Vec<String>,
+}
+
+impl Member {
+    pub fn new(name: String) -> Self {
+        Member {
+            name,
+            borrowed_books: Vec::new(),
+        }
+    }
+
+    pub fn list_borrowed_books(&self) {
+        if self.borrowed_books.is_empty() {
+            println!("{} hasn't borrowed any books.", self.name);
+        } else {
+            println!("\n📚 {}'s Borrowed Books:", self.name);
+            for book in &self.borrowed_books {
+                println!("  - {}", book);
+            }
+        }
+    }
+}
\ No newline at end of file

From 29174bd5b956eac08d7cf97c7bf8d73f99a068ca Mon Sep 17 00:00:00 2001
From: yahia008 <120284117+yahia008@users.noreply.github.com>
Date: Fri, 12 Jun 2026 11:06:08 +0000
Subject: [PATCH 9/9] library management

---
 rust_session/yahia008/minilib/src/library.rs | 20 +++++++++----------
 rust_session/yahia008/minilib/src/main.rs    | 21 +++++++++++++++++++-
 rust_session/yahia008/minilib/src/member.rs  |  2 +-
 3 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/rust_session/yahia008/minilib/src/library.rs b/rust_session/yahia008/minilib/src/library.rs
index d3d11a0d..bba3da9f 100644
--- a/rust_session/yahia008/minilib/src/library.rs
+++ b/rust_session/yahia008/minilib/src/library.rs
@@ -25,17 +25,17 @@ impl Library {
             available,
         };
         self.books.push(new_book);
-        println!("✅ Book added successfully!");
+        println!("Book added successfully!");
     }
 
 
     pub fn list_books(&self) {
         if self.books.is_empty() {
-            println!("📚 No books in the library yet!");
+            println!(" No books in the library yet!");
             return;
         }
         
-        println!("\n📚 Library Collection:");
+        println!("\nLibrary Collection:");
         println!("{:<30} {:<25} {:<10}", "Title", "Author", "Available");
         println!("{}", "-".repeat(65));
         
@@ -64,14 +64,14 @@ impl Library {
             if book.available {
                 book.available = false;
                 member.borrowed_books.push(book.title.clone());
-                println!("✅ '{}' has been checked out by {}", title, member.name);
+                println!("'{}' has been checked out by {}", title, member.name);
                 return true;
             } else {
-                println!("❌ '{}' is already checked out!", title);
+                println!(" '{}' is already checked out!", title);
                 return false;
             }
         }
-        println!("❌ Book '{}' not found!", title);
+        println!(" Book '{}' not found!", title);
         false
     }
 
@@ -81,14 +81,14 @@ impl Library {
             if !book.available {
                 book.available = true;
                 member.borrowed_books.retain(|b| b != title);
-                println!("✅ '{}' has been returned by {}", title, member.name);
+                println!(" '{}' has been returned by {}", title, member.name);
                 return true;
             } else {
-                println!("❌ '{}' wasn't checked out!", title);
+                println!(" '{}' wasn't checked out!", title);
                 return false;
             }
         }
-        println!("❌ Book '{}' not found!", title);
+        println!("Book '{}' not found!", title);
         false
     }
 
@@ -100,7 +100,7 @@ impl Library {
             println!("  Author:    {}", book.author);
             println!("  Status:    {}", if book.available { "Available" } else { "Checked Out" });
         } else {
-            println!("❌ Book '{}' not found!", title);
+            println!(" Book '{}' not found!", title);
         }
     }
 }
\ No newline at end of file
diff --git a/rust_session/yahia008/minilib/src/main.rs b/rust_session/yahia008/minilib/src/main.rs
index 23a2a1a0..213b1892 100644
--- a/rust_session/yahia008/minilib/src/main.rs
+++ b/rust_session/yahia008/minilib/src/main.rs
@@ -27,6 +27,25 @@ fn main() {
         println!("Found: {}", book.title);
     }
     
-    
+    println!("\n--- Checkout Process ---");
+    library.checkout_book("48 laws of power", &mut member);
+    library.checkout_book("meditation", &mut member);
+    library.checkout_book("romeo an julliet", &mut member);
+       
+     member.list_borrowed_books();
+
+    println!("\n--- Book Info ---");
+    library.display_book_info("48 laws of power");
+    library.display_book_info("romeo an julliet");
 
+    println!("\n--- Return Process ---");
+    library.return_book("48 laws of power", &mut member);
+
+    println!("\n--- Updated Library ---");
+    library.list_books();
+
+
+    println!("\n--- rasputins's Remaining Books ---");
+    member.list_borrowed_books();
+    
 }
\ No newline at end of file
diff --git a/rust_session/yahia008/minilib/src/member.rs b/rust_session/yahia008/minilib/src/member.rs
index b5ac1331..4cc663cd 100644
--- a/rust_session/yahia008/minilib/src/member.rs
+++ b/rust_session/yahia008/minilib/src/member.rs
@@ -16,7 +16,7 @@ impl Member {
         if self.borrowed_books.is_empty() {
             println!("{} hasn't borrowed any books.", self.name);
         } else {
-            println!("\n📚 {}'s Borrowed Books:", self.name);
+            println!("\n {}'s Borrowed Books:", self.name);
             for book in &self.borrowed_books {
                 println!("  - {}", book);
             }