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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.
Actually I fear your code was faulty, needlessly modifying the array in place. Fixed that, so that even not so efficient and bad practice solutions might work.
I can't edit the test cases right now. Can someone provide access to edit my Kata pls? :p In the meantime, I've gone and changed the title and description to match the test cases.