feat: assignment 3

[anonfedora]

Add Memory Management Utilities and Type Conversion Features

Overview

This PR introduces a suite of utility functions for safe type conversions and comprehensive documentation for Rust memory management features. The changes focus on providing robust type conversion utilities while maintaining Rust's safety guarantees.

Changes

• Implement safe integer type conversion utilities (u8 ↔ u32)
• Add String to &str conversion utilities with memory safety options
• Implement checked arithmetic operations for signed integers
• Add documentation for floating-point precision (f32/f64)
• Add comprehensive pointer and memory management guide

Implementation Details

• Added overflow checking for integer conversions
• Provided both safe and leak-based String to &str conversions
• Implemented arithmetic operations with proper error handling
• Documented floating-point precision trade-offs
• Created detailed guide for pointer usage and memory management

Safety Considerations

• All integer conversions include overflow checks
• String conversions provide both safe and explicit leak options
• Arithmetic operations use checked variants
• Raw pointer operations are properly documented as unsafe
• Memory management follows Rust ownership rules

Documentation

• Added comprehensive guides for floating-point types
• Included detailed pointer management documentation
• Added usage examples for all utilities
• Documented performance implications