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: XTvynTEMpnKChFnxukxcRdfNFdpUQm

A: XTvynEMpKChFxukcRdfNUQm
****
Q: UdKQazyGqYGzbUzaazcJhE

A: UdKQazyGqYbcJhE
****
Q: UdKQazyGqYGzbUzaazcJhE

A:
UdKQazyGqYbcJhE
****
