diff --git a/build.py b/build.py
index e69de29..9ca16f4 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,18 @@
+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)):
+# Keep iterating through the 1st index and keep pushing the 1st value to the last.
+# if the string matches to the 2nd string then it its rotational.
+# i = 0 --> s[0:] + s[] = s2 ?  -- ABCD + [] = CDAB (No)
+# i = 1 --> s[1:] + s[1] = s2? --- BCD + A = CDAB (No)
+# i = 2 --> s[2:] + s[0:2] = s2? -- CD + AB = CDAB (Yes)
+# Hence rotational
+        if s1[index:]+s1[0:index] == s2:
+            return True
+    return False
diff --git a/build.pyc b/build.pyc
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index 0000000..027ab18
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
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index 0000000..0e0be32
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diff --git a/tests/test_is_rotation.pyc b/tests/test_is_rotation.pyc
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index 0000000..8f8b5de
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