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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.
unless I'm blinder than usual, I took care of that x)
Print the input to see what it was, are you mutating the input?
The first value is what your function returned, not the input value. The second one is the expected result.