"don't" being turned into "don t" is due to the way search indexes work. It's a computer science problem, not Google specific.
The index is like a dictionary - you look things up by word. But you need to find some way to split up every page on the internet to decide what is a 'word' and what isn't. If you decide that quote marks are part of a word, then you'll end up with apple and apple' making different entries in the index which you probably didn't want.
The index is like a dictionary - you look things up by word. But you need to find some way to split up every page on the internet to decide what is a 'word' and what isn't. If you decide that quote marks are part of a word, then you'll end up with apple and apple' making different entries in the index which you probably didn't want.