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.

Example Input: YoJYejBwcUKVbOsBpadYe
Example Output: YoJejBwcUKVbOspad

Example Input: PxUaJWAyOQWYxYpOHuccQUtHoJOV
Example Output: PxUaJWAyOQYpHuctoV

Example Input: xUjcowAqalitkJpylEen
Example Output:
xUjcowAqalitkJpyEen