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: vZkZGttDlRuvwPzFhbTCsxSMzjWKI

SOLUTION: vZkGtDlRuwPzFhbTCsxSMjWKI

PROBLEM: DmWHbaDBQZdQpXVeMeiml

SOLUTION: DmWHbaBQZdpXVeMil

PROBLEM: XjRLBIuGSzGcqVUCMPmbiFBnjKR

SOLUTION:
XjRLBIuGSzcqVUCMPmbiFnK

