go byte to int

package main

import "fmt"

import "encoding/binary"
import  "bytes"

import "strconv"

type IPAddr [4]byte

// TODO: Add a "String() string" method to IPAddr.

func (self IPAddr) String()string{
    var ip string
    var num uint8
    for index,val:=range self{
        buff:=bytes.NewReader([]byte{val})//creating new read stream
        binary.Read( buff, binary.BigEndian,&num)

        if index==len(self)-1{
            ip+=strconv.Itoa(int(num))
           return ip
        }
        ip+=strconv.Itoa(int(num))+"."
    }

    return ip
}
func main() {
    hosts := map[string]IPAddr{
        "loopback":  {127, 0, 0, 1},
        "googleDNS": {8, 8, 8, 8},
    }

    for name, ip := range hosts {
        fmt.Printf("%v: %v\n", name, ip)
    }
}