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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, it's just your code isn't 100% right. Sample tests are just that, a sample of the full test suite. Read this: https://docs.codewars.com/training/troubleshooting
When I test my code I pass but when I Attempt I fail, I'm just gonna assume the compiler doesn't work
What does the '0' do... very very nice code btw!