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Ah my bad I didn't notice(or know about) the StringBuilder seems like a handy little class alright. I would go with helloworld on this one seems simple and elegant and probably along the lines you...

The problem there is you are replacing the whole string with 1 character I believe.

I don't think theres any way to just replace 1 character in a string. What you want to do is declare a temporary...

OK so how did you actually try to change it? I mean I think that logic is right but have you actually tried changing the characters yet? I would say you should declare a temporary string and reset it...