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]: XScNwVaKLcfLaacGFEtJxiwRONbN
[EX A]: XScNwVaKLfGFEtJxiROb

[EX Q]: YBzIMCsiNvbQNvaPVdtGtoPNQ
[EX A]: YBzIMCsiNvbQaPVdtGo

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