I'm not sure sure if I answered this with the previous post, but here it goes.
the charAt() method returns a variable of type char which you are trying to assign to a String reference. wrong type.
Also
you should not be making so many posts, these questions have been related to the same problem and you should have just asked them in the same
thread, much less confusing. Also if you keep creating extra posts for essentially the same/similar topic some people may become annoyed and be less lickely to help you.