dst := make([]byte, hex.DecodedLen(len(src)))
	n, err := hex.Decode(dst, src)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s\n", dst[:n])

	// Output:
	// Hello Gopher!
}

func ExampleDecodeString() {
	const s = "48656c6c6f20476f7068657221"
	decoded, err := hex.DecodeString(s)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s\n", decoded)

	// Output:
	// Hello Gopher!
}