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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.
Nearly 700 solutions has passed, so it is most likely your solution not doing exactly what is required.
You can post (as a comment) your current solution here and mark it as "Spoiler". Warriors already having solved the kata can then assist in pointing out what may be wrong (your code or the test code).