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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.
That's a problem with your code, not a kata issue, read this: https://docs.codewars.com/training/troubleshooting
Don't use global vars, they keep their value between tests.
My code in my IDE is fine but in codewars I get an error, I don't know if I'm doing something wrong or it's from the page