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: UdsGvNQzdrCqOThbXfoAomAJflSPec
Example Output: UdsGvNQzrCqOThbXfoAmJlSPec

Example Input: ymiDSDINLYJcPFTeXDVvWdA
Example Output: ymiDSINLYJcPFTeXVvWdA

Example Input: czewqqMLGCBKQLVGDtng
Example Output:
czewqMLGCBKQVDtng

