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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 aware of any requirement that kata specs make real-world sense.
I am the developer, that's why it's my kata. Should I attribute it to myself? I actually don't have any idea how to do that.
The whitespace requirements are clearly outlined in the description, and are there on purpose. They do have a bearing on the correctness of the solution because that's how the solution was defined.