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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.
Don't even thought about subtracting :(
I am feeling such an idiot.
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If it were that easy, there would be no reason to write in a comments :) Also "throw" is one second googling, I think everybody know how to "throw" errors.
But still I can't resolve this issue too.
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"Note that an empty string, or no arguments, should return an empty string."
This solution will not work, if you enter NO arguments.
3 years later - I got it, thank you for awesome answer )