code: def find_c_file(obj_file, vpath):
      
      c_file = None
      relative_c_file = os.path.splitext(obj_file)[0] + ".c"
      relative_c_file = relative_c_file.lstrip('/\\')
      for p in vpath:
          possible_c_file = os.path.join(p, relative_c_file)
          if os.path.exists(possible_c_file):
              c_file = possible_c_file
              break
  
      return c_file
docs: Search vpaths for the c file that matches the provided object_file.
  
      :param str obj_file: object file to find the matching c file for
      :param List[str] vpath: List of base paths, similar to gcc vpath
      :return: str path to c file or None