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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.
Hi,
there is no reason for this kata to return a string (in C++), so it shouldn't. While building the return string isn't hard, it's annoying and distracts from the main task. Returning a collection of pairs seems more appropriate.