code: def distance_between(self, string, start, end):
          
          count = 0
          started = False
  
          for line in string.split("\n"):
  
              if self.scan_line(line, start) and not started:
                  started = True
  
              if self.scan_line(line, end):
                  return count
  
              if started:
                  count += 1
  
          return count
docs: Returns number of lines between start and end