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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 solution is most likely wrong. You can paste your code with test cases that you think don't work correctly and maybe somebody will help you.
My kata solution in vscode gives the correct result, but the opposite in codewars.