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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.
Should have more and random tests (eg. with incorrect links).
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Test cases are wrongly written. According to description result shoud be rounded to 4 decimal places but tests don't do this.
In description, function should return "Error 404" when given parameter is not an integer but in code, it's written that function should return "Invalid Value".