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]: vqjyphcluSVsBtlQGXUvzwFBa
[EX A]: vqjyphcluSVsBtQGXUzwFa

[EX Q]: syWqVWrvlDarbXGGXvjghpC
[EX A]: syWqVrvlDabXGjghpC

[EX Q]: VcrgYTUvOnvbXXSZoTTgrtPoOIhlUW
[EX A]:
VcrgYTUvOnbXSZotPIhlW