I'm reluctant to say any more than the piece of the puzzle that seems to be missing. Here I was looking to question if there was anything at all different about space as a character in a string, if so there's a big misunderstanding in what strings are and you'd have to motivate how it was any different so that the misunderstanding could be cleared out, or you would see that it's just another character and the instructions you referred to were silly.
I generally get more vague as questions get vague, people are always free to explain their thoughts and ask more direct questions, that's how they would solve the issue themselves anyway.
Some will consider the responsibility of providing the right explanation to be mine. I consider it to be yours, because that's how you learn to find things out. This is where teachers will sometimes seem like they are taunting the student, I'm sure you've seen others do this, trying to get the student to ask the right questions. There's another kind of teacher that gives up and just hands over the conclusions. That's not worth my time.. Or yours.