You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: abi_pack.go
    path of file: ./repos/ethereum-development-with-go-book/code
    
    the code of the file until where you have to start completion: package main

import (
	"context"
	"fmt"
	"log"
	"strings"

	ethereum "github.com/ethereum/go-ethereum"
	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum
    
func main() {
	client, err := ethclient.Dial("https://rinkeby.infura.io")
	if err != nil {
		log.Fatal(err)
	}

	abiContract, err := abi.JSON(strings.NewReader(string(store.StoreABI)))
	if err != nil {
		panic(err)
	}

	var key [32]byte
	copy(key[:], []byte("foo"))
	iargs := []interface{}{key}

	packed, err := abiContract.Pack("items", iargs...)
	if err != nil {
		panic(err)
	}

	fmt.Println(packed) // [72 243 67 243 102 111 111 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]

	contractAddress := common.HexToAddress("0x147b8eb97fd247d06c4006d269c90c1908fb5d54")

	msg := ethereum.CallMsg{
		To:   &contractAddress,
		Data: packed,
	}

	output, err := client.CallContract(context.Background(), msg, nil)
	if err != nil {
		panic(err)
	}

	var item [32]byte
	err = abiContract.Unpack(&item, "items", output)
	if err != nil {
		panic(err)
	}

	fmt.Println(string(item[:])) // "bar"
}