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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.
Your code is wrong, it's not a kata issue.
I am having problems for whatever reason, I did my code on an IDE with the same test cases and all are correct however when I translate them over it marks some test cases incorrect for example 12 etc.