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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.
Could you please check test cases (as already user ds13 wrote). It seems that there's incorrect result for input "1804289383".
I'm not quite sure about it, but seems that there should be "std::string" instead of "string" in the function proposal.
BTW. I've enjoyed your's task