diff --git a/build.py b/build.py
index e69de29..e1348fa 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,10 @@
+import re
+def is_rotation(string, rot_string):
+    if string is None or rot_string is None:
+        return False
+    if len(string) != len(rot_string):
+        return False
+    if re.search(rot_string, string+string):
+        return True
+    else:
+        return False
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..09c5dde
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..737a493
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diff --git a/tests/test_is_rotation.pyc b/tests/test_is_rotation.pyc
new file mode 100644
index 0000000..1f7604f
Binary files /dev/null and b/tests/test_is_rotation.pyc differ