Detailed Instructions: 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.
See one example below:
Problem: abCCdDDgGGhi
Solution: abCdDgGhi
Explanation: The input string has 3 duplicate characters and the resulting output string has no duplicate characters.

Problem: UdKQazyGqYGzbUzaazcJhE
Solution:
UdKQazyGqYbcJhE