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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.
Test case added
Great job. You found a number of issues that needed to be corrected. I've updated the test cases and description. Since you didn't cover the zero input case your solution (and a lot of others) will now be invalid.