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]: wrSaiSqvLVWTonDdYQMRvQVZajrYEw
[EX A]: wrSaiqvLVWTonDdYQMRZjE

[EX Q]: RSIIYSRjhKYxdfDrFUukVHMOcYR
[EX A]: RSIYjhKxdfDrFUukVHMOc

[EX Q]: WCrFKLIvyJDqmFRdOWnuDEnAjMMT
[EX A]:
WCrFKLIvyJDqmRdOnuEAjMT