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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.
Yes, you need to include the libraries yourself. Read this too: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
I was attempting the problem in c++. I'm not sure if I have include the libraries myself, coz I tried using toupper() function and there is a weird error shown.