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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.
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Best and fast :)
You change initial condition
Thus you made two copies of string, first - when signature passed, second - when return value
Therefore it is a BAD practices ...