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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.
The problem with your code was related to the fact that strings are mutable in Ruby, so you were messing up the expected values.
800 Ruby solutions - unprobable that it's kata issue and not a problem with your code.