code: func hashOnLineBreak(s string) string {
  	r := ""
  	for i, ch := range s {
  		j := i + 1
  		if j < len(s) && ch == '\n' && s[j] != '#' {
  			r += "\n# "
  		} else {
  			r += string(ch)
  		}
  	}
  	return r
  }
docs: // hashOnLineBreak returns a string built from the provided string by inserting any necessary '#'
  // characters after '\n' characters, indicating a comment.