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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 don't understand what the issue is. As "There are no multiple spaces in the test cases." you don't need to care about them. If the issue is that there are languages with multiple or trailing spaces please raise a new issue and list the languages.
Regards,
suic
Mention the language, maybe the problem exists in a language and not in another.