GetStringInBetween() with a bug fix

get_string_in_between.go

package main

import (
	"fmt"
	"strings"
)

func main() {
	str := []byte("sdfsdffio jeo <!--foo wij ewie jo fwiejwoeifjwoeifjoweifjo --> weifj ow ejowifj woesdfsdffio jeo <!--bar wij ewie jo fwiejwo2222222222eifjwoeifjoweifjo --> weifj ow ejowifj woe<!--bars  -->")
	fmt.Println(GetStringInBetween(string(str), "<!--foo ", " -->"))
	fmt.Println(GetStringInBetween(string(str), "<!--bars ", " -->"))
	fmt.Println(GetStringInBetween(string(str), "<!--bar ", " -->"))
	/*
	wij ewie jo fwiejwoeifjwoeifjoweifjo
	
	wij ewie jo fwiejwo2222222222eifjwoeifjoweifjo
	*/
}

// GetStringInBetween Returns empty string if no start string found
func GetStringInBetween(str string, start string, end string) (result string) {
	s := strings.Index(str, start)
	if s == -1 {
		return
	}
	s += len(start)
	e := strings.Index(str[s:], end) + s // fix
	return str[s:e]
}

// ref)
// https://stackoverflow.com/questions/26916952/go-retrieve-a-string-from-between-two-characters-or-other-strings