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]: hyRBumMJLvVnUJCVvrXaNEaR
[EX A]: hyRBumMJLvVnUCrXaNE

[EX Q]: osRkjysAYNKHZYSWIEORxnZJWf
[EX A]: osRkjyAYNKHZSWIEOxnJf

[EX Q]: yNuwnqBsSCMSttcxfDtHV
[EX A]:
yNuwnqBsSCMtcxfDHV

