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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 isn't even tail-recursive so it doesn't matter if Java supports tail call elimination.
I've rewritten it using
StringBuilderand tail-recursion. You may want to check it out.Concatenation, each time a new string is created.