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: EJBeIJMJeQDbzsfHyboQYmMTwAymEy
Example Output: EJBeIMQDbzsfHyoYmTwA

Example Input: IVaFaBpctNpNNKUdFNuXUAvfZNlVKL
Example Output: IVaFBpctNKUduXAvfZlL

Example Input: ITwcXZeghTDQLscvixOLpL
Example Output:
ITwcXZeghDQLsvixOp