In this task, you are given a string of characters. You need to remove duplicate characters from the string if any, and return the resulting string.

ddoeHjaUVbJxtOpJywIOgn
doeHjaUVbJxtOpywIgn

svXUmWkfhlqXHzycFKmUYwMTsD
svXUmWkfhlqHzycFKYwMTD

syWqVWrvlDarbXGGXvjghpC

syWqVrvlDabXGjghpC