Split a character string based on change of character

Here's an example program that splits a (character) string into new line based on a change of character or space.

strBuf is a variable-sized buffer of bytes with Read and Write methods.

WriteString appends the contents of strBuf to the buffer, growing the buffer as needed.

Using a for loop we write the content to strBuf and line break "\n" added on change of a character in str string.

The final piece of our program fmt.Println(strBuf.String()) is used to display the output.
package main

import (
	"bytes"
	"fmt"
)

func main() {
	str := `aaaabbbbccccddddeee\\\\2222 mmmm,88888`
	if len(str) < 2 {
		fmt.Println(str)
	}
	var strBuf bytes.Buffer // A Buffer needs no initialization.
	indx := str[0]

	strBuf.WriteByte(indx)
	for _, count := range []byte(str[1:]) {
		if count != indx {
			strBuf.WriteString("\n")
		}
		strBuf.WriteByte(count)
		indx = count
	}
	fmt.Println(strBuf.String())
}
C:\example>go run ex1.go
aaaa
bbbb
cccc
dddd
eee
\\\\
2222

mmmm
,
88888

C:\example>