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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.
You're mutating the input.
Don't use global vars, they keep their values between tests.
But do you interpret the logs correctly?
And how do you know that your solution is correct?