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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
If you are doing this in C#, the testcases are swapped around. So your code is returning "nixosvauqlCyjntckjtgAsjttbfyhx" and the expected answer is "nixosvauql_cyjntckjtgAsjttbfyhx". This can be proven if you print/output your result to the console.
Currently Codewars platform is experiencing issues.
https://github.com/Codewars/codewars.com/issues/893