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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 could be wrong, but doesn't this solution run through every character in the String? Would a solution that iterates through the String's characters and ends after finding two identical characters be more efficient?