Placeholder

placeholder.go

package main

import (
	"fmt"
	"strconv"
	"strings"
)

func main() {
	x := generateMessage("Hello {0}, you have {1} new messages!", "Gerep", "12")
	fmt.Println(x)
}

func generateMessage(m string, p ...interface{}) string {
	for k, v := range p {
		i := strconv.Itoa(k)
		m = strings.Replace(m, "{"+i+"}", fmt.Sprintf("%s", v), -1)
	}
	return m
}