diff --git a/build.py b/build.py
index e69de29..b4f3239 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,21 @@
+
+def is_rotation(s1, s2):
+    if s1 is None or s2 is None:
+        return False
+
+    if len(s1) != len(s2):
+        return False
+
+    if len(s1) == len(s2) == 0:
+        return True
+
+    for i in range(len(s1)):
+        rotated = s2[i+1:] + s2[:i+1]
+        if rotated == s1:
+            return True
+    return False
+
+s1 = 'rotation'
+s2 = 'tationro'
+
+print(is_rotation('',''))
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..93bbe8b
Binary files /dev/null and b/build.pyc differ
diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..c3f45b6
Binary files /dev/null and b/tests/__init__.pyc differ
diff --git a/tests/test_is_rotation.pyc b/tests/test_is_rotation.pyc
new file mode 100644
index 0000000..5391447
Binary files /dev/null and b/tests/test_is_rotation.pyc differ