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: gjroYPFlHUuyuFQeDOEpoLOWKZ
Example Output: gjroYPFlHUuyQeDOEpLWKZ

Example Input: jSaIWbdMCplOzSWMyxtOHQDc
Example Output: jSaIWbdMCplOzyxtHQDc

Example Input: vqjyphcluSVsBtlQGXUvzwFBa
Example Output:
vqjyphcluSVsBtQGXUzwFa

