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.

[EX Q]: eTQEYpRLCBTUArhguybuF
[EX A]: eTQEYpRLCBUArhguybF

[EX Q]: ErwHePmuudRDrIRMurbeqIV
[EX A]: ErwHePmudRDIMbqV

[EX Q]: NppGiDtphEonPjnwXqBwfB
[EX A]:
NpGiDthEonPjwXqBf