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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.
The use of r-value refs was a good call, best practice probably as well. I was wondering while I did my solution how I could reduce/optimize my code, and this is exactly it. Good job!