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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're right ! The first part is completely useless. I can't remember why I did that. It was my first time using vectors.
Copying all the names to another vector and counting them is a lot of unnecessary work. Use vector::size() to get the count and don't copy anything.