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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.
This solution seems to be missing an empty string check, thus potential undefined behaviour: https://en.cppreference.com/w/cpp/string/basic_string/pop_back
Since c++11 it's allowed to use simpler initialisation lists for (amongst others) maps, so instead of std::make_pair('A', 'T') you may use just {'A', 'T'}