Related to hearing in lower court suggestion

related to the admission once the petitioner has been filed the writ petition in the high court and after that for same matter same petitioner has filed G r case in c g m court and police has been submitted the final report and indicated that there is no involvement of accused ,but on the basis of protest petition , of single witness magistrate has taken the cognizance against the accused. what is the best way to stop /quash the on going case in lower court. secondly same case can continue in two places in high court it is wp c and lower court it is 420