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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.
It is not recommended to have recursion instead of loop in enterprise applications, because of higher memory usage, performance overhead, and in general being harder to debug/maintain.
You could declare variable c out of for, that variable will created for one times