strings.Builder has significantly better performance than bytes.Buffer and should be used instead.
Some minor changes have also been made to the tests, including replacing a call to fmt.Fprintln with Fprint and using !strings.Contains instead of strings.Index(s, substr) == -1.
strings.Builderhas significantly better performance thanbytes.Bufferand should be used instead.Some minor changes have also been made to the tests, including replacing a call to
fmt.FprintlnwithFprintand using!strings.Containsinstead ofstrings.Index(s, substr) == -1.