<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def gen_oui_str(self, oui_list):
 """Generate the OUI string for vdptool. """

        oui_str = []
        for oui in oui_list:
            oui_str.append('-c')
            oui_str.append(oui)
        return oui_str