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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 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.
what if we have a string that has some space at the end of it!
the way einstein sees 1+1=2