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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.
Description is adequate. Not a kata issue.
You aren't handling when an empty string is passed in. You need to return null if an empty string is passedd in