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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.
You should never mutate inputs, unless it's specified in the contract. Doing this is generating side effects (ie changing the state of the universe outside of the function), and you don't want to code like that. => Rust is right, here.
Looks clean! I'm in the process of learning Rust and I didn't even know about
fold
. Thank you!