package main

import (
	"fmt"
	"strings"
	"time"
)

func main() {
	start := time.Now()
	defer func() {
		end := time.Now()
		fmt.Println(end.Sub(start))
	}()
	s := "treeoneone"
	str := strings.Replace(s, "treeone", "forest", -1)
	fmt.Println(str)
}