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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.
Not be snarky, but 7000 users have managed to solve it. There is very likely a problem with your code.
That said, it's not helpful to just say "this doesn't work". What doesn't work? What tests are you failing? What are the inputs, what did you output? What was the expected result?