code: def read_cstring(self, terminator=b'\x00'):
          
          null_index = self.data.find(terminator, self.offset)
          if null_index == -1:
              raise RuntimeError("Reached end of buffer")
          result = self.data[self.offset:null_index]  # bytes without the terminator
          self.offset = null_index + len(terminator)  # advance offset past terminator
          return result
docs: Reads a single null termianted string
  
          :return: string without bytes
          :rtype: :class:`bytes`