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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.
Why? I see on cppreference that it has been in standard since C++11. Since the solution has already tested if the result is empty, I think there won't be any undefined behavior here.
Yes, actually we have a problem right here. Just checked and std::string does not terminates in NULL, I thought that was the case.