diff --git a/build.py b/build.py
index e69de29..cc0208b 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,7 @@
+def is_rotation(s1, s2):
+    if s1 is None or s2 is None:
+        return False
+    elif s1 == s2 or (s2 in s1*2 and len(s1) == len(s2)):
+        return True
+    else:
+        return False
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..ebaf9dd
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..9344709
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..c66ed1c
Binary files /dev/null and b/tests/test_is_rotation.pyc differ