TASK DEFINITION: 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.
PROBLEM: CHIKoErswWcbipbgjjmyU

SOLUTION: CHIKoErswWcbipgjmyU

PROBLEM: XScNwVaKLcfLaacGFEtJxiwRONbN

SOLUTION: XScNwVaKLfGFEtJxiROb

PROBLEM: tOjAVemnYuDKuvgyhlOuFwxJb

SOLUTION:
tOjAVemnYuDKvgyhlFwxJb