This one should work for all of the test cases except that you have some numerical precision issues with the last test case. Please replace it with a numerical comparison that takes into account precision (my code is returning numbers with no decimal point but the test code returns something less pretty).
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Encode Roman Numerals
Project Euler: Problem 1, Multiples of 3 and 5
Find Rotated Substring
Moving average (variable kernel length)
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