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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.
This does not constitute a valid kata issue, sorry. For such questions you should use "question" label.
I just pasted your code and it passes... Did you select ruby version 3?