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: czewqqMLGCBKQLVGDtng

A: czewqMLGCBKQVDtng
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Q: PkHwzoXRUCvjtJtXOXbcvzDJ

A: PkHwzoXRUCvjtJObcD
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Q: huZGjSZbzraOBIBjsbJmLZ

A:
huZGjSbzraOBIsJmL
****