Efficient hash of string concatenation in go

Question

I need to make function that calculating hash of multiple large strings concatenation. How to do it efficient in go? To avoid unnecessary memory copies

I updated the question. Now the question is there a difference between make_hash and make_hash_ptr

func make_hash(v ...string) string {
    h := sha256.New()
    for _, s := range v {
        h.Write([]byte(s))
    }
    return hex.EncodeToString(h.Sum(nil))
}

func make_hash_ptr(v ...*string) string {
    h := sha256.New()
    for _, s := range v {
        h.Write([]byte(*s))
    }
    return hex.EncodeToString(h.Sum(nil))
}

func main() {
    s1 := "very large string...."
    s2 := "very large string...."
    s3 := "very large string...."
    hash := make_hash(s1, s2, s3)

    fmt.Println(hash)
}