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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.
Maybe it's better to begin the loop from 1?
Each time you modified a String it creates a new object, because it is inmutable. If you want to modify it you have to use StringBuilder for performamce, it is mutable