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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.
But why the goal would be to remove the last letter?
Am I missing something, or kata description, or anything, does not mention letters anywhere?
i meant that if the goal is removing last letter it won't work, because as you said php will count space as a caracter and we never can remove last letter because it will only remove spaces at the end of string . i hope i could exprime myself well.
How is space different from any other character?
what if we have a string that has some space at the end of it!