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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.
I think there is a problem with the random tests in Ruby. They all expect "0" when it is clearly not.
Thanks, I'd forgotten that mutating the string in place can lead to failed tests.
I think the random tests in Ruby are expecting the input not the output.