Merge pull request #26 from yoch/3-solution

solution to mutations problem

intermediate/mutations_yoch.py

@@ -0,0 +1,18 @@
+from collections import Counter
+
+def mutations(s1, s2):
+    c1 = Counter(map(str.lower, s1))
+    c2 = Counter(map(str.lower, s2))
+    c1.subtract(c2)
+    return all(n >= 0 for n in c1.values())
+
+tests = [
+    (["hello", "Hello"], True),
+    (["hello", "hey"], False),
+    (["Alien", "line"], True),
+    (["hel", "heel"], False)
+]
+
+for test, excepted in tests:
+    ret = mutations(*test)
+    assert ret == excepted