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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.
Start by reading this: https://docs.codewars.com/getting-started/solving-kata
If your code is including fault The problem haven't at the kata.
Why have you copied the sample tests to the code window? Click reset and start from scratch. Complete the function with your own code. Read the docs first.