diff --git a/build.py b/build.py
index e69de29..13291f6 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,7 @@
+def is_rotation(s1, s2):
+    if s1 is None or s2 is None or len(s1) < len(s2):
+        return False
+    double_s1 = 2*s1
+    if double_s1.find(s2) != -1:
+        return True
+    return False
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..cf81e15
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..4cc068f
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..ea13e22
Binary files /dev/null and b/tests/test_is_rotation.pyc differ