testing replace in go

replace.go

package main

import (
	"io/ioutil"
	"strings"
)

func replace(path string, oldValue string, newValue string) {
	
	read, err := ioutil.ReadFile(path)
	if err != nil {
		panic(err)
	}
	//Replace
	newContents := strings.Replace(string(read), oldValue, newValue, -1)

	err = ioutil.WriteFile(path, []byte(newContents), 0)
	if err != nil {
		panic(err)
	}
}