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: nCTfNLTHhSZkAhJRYGwESheWQVNZQU

A: nCTfNLHhSZkAJRYGwEeWQVU
****
Q: gIbVlYsnmQJkeQqsrmuup

A: gIbVlYsnmQJkeqrup
****
Q: FGhwvvBGIRusWiqUytlwJNHjLDB

A:
FGhwvBIRusWiqUytlJNHjLD
****