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.

Input: Consider Input: vZkZGttDlRuvwPzFhbTCsxSMzjWKI

Output: vZkGtDlRuwPzFhbTCsxSMjWKI

Input: Consider Input: MjGSdmgICPfwZJpwblfTUaGUlJna

Output: MjGSdmgICPfwZJpblTUan

Input: Consider Input: XttLMRTVbiQDKPMEXyeXPSoDGCehY
Output: XtLMRTVbiQDKPEyeSoGChY