count := 0
	for i, ch := range input {
		if prev == ch {
			count++
			if i != len(input)-1 {

	counter := 0
	for i, current := range input {
		if prev == current {
			counter++
			if i != len(input)-1 { // run the writing part for the last char

		if count > 1 {
			ret.WriteString(strconv.Itoa(count))
			count = 1

		if counter > 1 {
			ret.WriteString(strconv.Itoa(counter))
			counter = 1

		if i == len(input)-1 && prev != ch {
			ret.WriteRune(ch)

		if i == len(input)-1 && prev != current { // if last char != the previous
			ret.WriteRune(current)

		prev = ch

		prev = current