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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 isn't. And you've got some basic problems with it before it'll even compile in the kata, maybe fix those first? And then when you get it running it'll tell you what test cases it fails for, which will also fail locally, and then you can debug it.
This has already been answered below:
example_secret
is for testing your code only, it's not used for actual testing.Anyways, this is not an issue, please raise inqueries about your code (unless you can definitely prove it's the kata's fault) as a question next time.
(Also, you should go do some white katas instead)