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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'm not sure... I don't really speak Go so I can't comment too much on it. Is the test suite (for 'test' cases) set up incorrectly? (if so, do you know how to fix it?)
Why haven't you passed it then? I hit attempt and it's clearly not the case there.
None of these are kata issues, sorry.