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]: iPWVRLsWuvoiRCUfepWrofJ
[EX A]: iPWVRLsuvoCUfeprJ

[EX Q]: YMkiCvKjOpMYXaxHMGTZppIBGmpB
[EX A]: YMkiCvKjOpXaxHGTZIBm

[EX Q]: svXUmWkfhlqXHzycFKmUYwMTsD
[EX A]:
svXUmWkfhlqHzycFKYwMTD

