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.

[Q]: tHKixfuMiKESMqerSljlnIarbDl
[A]: tHKixfuMESqerljnIabD


[Q]: btxuUGwbmqGQQmnbzVxueefqReT
[A]: btxuUGwmqQnzVefRT


[Q]: keihwVKbNVrcHMLJFiGunIpPdXN
[A]:
keihwVKbNrcHMLJFGunIpPdX