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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.
C# Translation
Your random tests are vulnerable to input modification.
Also, don't just have random tests. Have some fixed tests as well. With some edge cases.
Did you read available documentation on publishing your first kata? You're making a lot of typical inexperienced-first-timer mistakes.
Please don't round. Please just ask for a floating point value and test by comparing with an error margin.
"Call a built-in" is a worthless kata idea.