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: eTQEYpRLCBTUArhguybuF

SOLUTION: eTQEYpRLCBUArhguybF

PROBLEM: dtwJlkEpgjUfBVBUvNlYwbEQVq

SOLUTION: dtwJlkEpgjUfBVvNYbQq

PROBLEM: xHCXluBTXtjlSLfosSmqok

SOLUTION:
xHCXluBTtjSLfosmqk

