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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.
I guess it's cuz the result is supposed to have double space i.e " " between the words and not " ".
try to use the pop() function, it removes the last element of your list
A problem with your code is not a kata issue, please read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
How to remove that extra space in the end? I am getting it "Real " which should be "Real"