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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 the right solution using the string class, however for the exercise you are not allowed to modify the base (the name of the function as well as the parameter given)