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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.
oh. my bad. thank you for pointing it out.
You are misreading the log: it tells you "your_answer should equal the correct_answer". Your function returns 'https://youtube' for the input 'https://youtube.com', which is incorrect.
'https://youtube' should equal 'youtube'
pardon if I sound frustrated. but, is that even a valid URL? should that testcase be allowed?