diff --git a/build.py b/build.py
index e69de29..1d467de 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,12 @@
+def is_rotation(s1,s2):
+    if s1 == None or s2 == None:
+        return False
+    if s1 == '':
+        if s2 == '':
+            return True
+        return False
+
+    for index in range(len(s1)):
+        if s1[index:]+s1[0:index] == s2:
+            return True
+    return False
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..712334a
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..cd8225d
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..ff444eb
Binary files /dev/null and b/tests/test_is_rotation.pyc differ