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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _vpcs_path(self):
 """ Returns the VPCS executable path. :returns: path to VPCS """


        search_path = self._manager.config.get_section_config("VPCS").get("vpcs_path", "vpcs")
        path = shutil.which(search_path)
        # shutil.which return None if the path doesn't exists
        if not path:
            return search_path
        return path