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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.
From my previous solution, I substituted the append() method with push_back(). push_back() allows me to not have to create a new string object of a single character each time in the loop.
From the previous solution, I removed the std::locale parameter from toupper. I didn't realize that was an optional paramter.