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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.
Check to see if there's a space at the end of your returned string. This was an issue on a previous KATA, could be your issue as well. Also maybe you're supposed to return a float or int? Are you sure its supposed to be a string?
If I was a developer working on a team with you I would pull out every single hair on my head trying to keep up.