code: func StringDiff(a, b string) string {
  	ba := []byte(a)
  	bb := []byte(b)
  	out := []byte{}
  	i := 0
  	for ; i < len(ba) && i < len(bb); i++ {
  		if ba[i] != bb[i] {
  			break
  		}
  		out = append(out, ba[i])
  	}
  	out = append(out, []byte("\n\nA: ")...)
  	out = append(out, ba[i:]...)
  	out = append(out, []byte("\n\nB: ")...)
  	out = append(out, bb[i:]...)
  	out = append(out, []byte("\n\n")...)
  	return string(out)
  }
docs: // StringDiff diffs a and b and returns a human readable diff.