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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.
Print the input value too, but afaik the kata tests are ok. The first one is the value your function returned and the second one the value it should have returned.
Your code is printing the result instead of returning it.