convert private key from hex string

gistfile1.txt

package main

import (
	"crypto/ecdsa"
	"encoding/hex"
	"fmt"
	"log"

	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/crypto"
)

func main() {
	// pub: 0xc9a0554956b0f41c378975892fef4cff7158e807
	// pri: 4aa770014d9a0324dea63ca32332561e752e0da861e18dc8a24a3894af2d789c

	const privKeyHex string = "4aa770014d9a0324dea63ca32332561e752e0da861e18dc8a24a3894af2d789c"
	key, err := hex.DecodeString(privKeyHex)
	if err != nil {
		fmt.Println("Failed to decode string")
		return
	}
	priKey, err := crypto.ToECDSA(key)
	if err != nil {
		fmt.Println("Failed generate private key")
		return
	}
	publicKey := priKey.Public()
	publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
	if !ok {
		log.Fatal("error casting public key to ECDSA")
	}
	publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA)
	fmt.Println(hexutil.Encode(publicKeyBytes)[4:])

	address := crypto.PubkeyToAddress(*publicKeyECDSA).Hex()
	fmt.Println(address)
}