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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.
I found using stringstream for solustion a bit confusing.
Seems like complication from nowhere to me.
If you need std::string why not just using that type and obvious concatination.
The clever side of that solution is leaving "-" character at first and cut it out in substr operation.
Anyway, how @adammusial mentioned before that solution left an exception in that cleverness.