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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.
I'd suggest to add corner cases to the tests as well. I think some solutions would get an indexOutOfBoundsException if the input string would be "the-stealth_warrior-".