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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.
Unfortunately no, hence the "Error: execution of an external program failed: '/workspace/tests '".
Nevertheless all was green because the testing function was wrongly placed.
It is fixed now and you will be able to see where your function has flaws.
I see you don't have a great practice of CW so you must know that when you post code, as you did, you have to mark your post as "Spoiler" (Red label. I did it for you). Cheers.