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: btxuUGwbmqGQQmnbzVxueefqReT

SOLUTION: btxuUGwmqQnzVefRT

PROBLEM: UdKQazyGqYGzbUzaazcJhE

SOLUTION: UdKQazyGqYbcJhE

PROBLEM: yxTlQSKsXczzwVbftQmlSyDnudusMZ

SOLUTION:
yxTlQSKsXczwVbftmDnudMZ