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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.
No, Codewars does not require you to mess with compiler options to get things to work. If your solution does not pass tests for some reason, the code is most probably not completely correct.
I am available on Codewars Discord, but you can post your code here in the kata discourse even if it does not pass tests: https://docs.codewars.com/training/troubleshooting#post-discourse
My c++ solution still works, so I believe the kata is OK. its hard to say without seeing your code, but if i were to guess, I'd check if you have no trailing or leading junk characters in returned string.