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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.
Rust is a pass by value language so really this is only mutating the function local value.
As long as the input variable is not a reference there's no risk of mutating the passed in value from the perspective of the caller.