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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 don't see how this would be better than recursion and how you can put the characters in the middle of the string, if you ask me, but ok :)
Yours is a very skillful solution indeed. Thanks for explaining its implementation.