From the description: The questions array is already defined for you and is not the same as the one in the example. Drop the questions array and it will pass.

Done! :)

I think the Ruby tests are broken:

Random Tests

Testing for ccbacacacbaabb
It should work for random inputs too - Expected: "", instead got: "cbacacacbaab"
Testing for bacbccbc
It should work for random inputs too -  Expected: "", instead got: "acbccb"
Testing for aaccbcacacbaaa
It should work for random inputs too -  Expected: "", instead got: "accbcacacbaa"
Testing for cccaa
It should work for random inputs too -  Expected: "", instead got: "cca"
Testing for acbabbaba
It should work for random inputs too -  Expected: "", instead got: "cbabbab"
Testing for abbababba
It should work for random inputs too -  Expected: "", instead got: "bbababb"
Testing for aaaccaaccabcabcbbccc
It should work for random inputs too -  Expected: "", instead got: "aaccaaccabcabcbbcc"
Testing for bbacbbaaabbaabbcac
It should work for random inputs too -  Expected: "", instead got: "bacbbaaabbaabbca"
Testing for caaabcc
It should work for random inputs too -  Expected: "", instead got: "aaabc"
Testing for cab
It should work for random inputs too -  Expected: "", instead got: "a"
Testing for bccbabbabbcbcaa
It should work for random inputs too -  Expected: "", instead got: "ccbabbabbcbca"

Made it! Didn't even have to leave out explicit variable declarations in the end :) That was fun!

"your code length = 81 - Expected: code length<=80"
:(

Sorry for the later reply. JosephBNolan it's usersAnswer not userAnswer.

As already said, this needs more test cases.

I think you meant 'answer', not 'answear'.

Could use more test cases imo, otherwise well done.

The description asks to create a method, but the solution expects a function.

Since the function takes not only strings but also integers I'd suggest changing the function's argument placeholder.