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: gIbVlYsnmQJkeQqsrmuup

SOLUTION: gIbVlYsnmQJkeqrup

PROBLEM: ysbPVZPTUdvimMzWIKPfyYIVrpGq

SOLUTION: ysbPVZTUdvimMzWIKfYrpGq

PROBLEM: QyYdHTVupfGnwJLOYhBhifYIjPSd

SOLUTION:
QyYdHTVupfGnwJLOhBiIjPS

