pointers - How to copy an interface value in Go?

Question

How to copy an interface value in Go?

My User interface:

type User interface {
    Name() string
    SetName(name string)
}

My Admin struct:

type Admin struct {
    name string
}

func (a *Admin) Name() string {
    return a.name
}

func (a *Admin) SetName(name string) {
    a.name = name
}

I try to copy user1's value.

Main Function:

func main() {
    var user1 User
    user1 = &Admin{name:"user1"}

    fmt.Printf("User1's name: %s
", user1.Name())

    var user2 User
    user2 = user1
    user2.SetName("user2")

    fmt.Printf("User2's name: %s
", user2.Name()) // The name will be changed as "user2"
    fmt.Printf("User1's name: %s
", user1.Name())  // The name will be changed as "user2" too, How to make the user1 name does not change？
}

How to achieve that changing the copy's name the original doesn't change?

Answer 1

Waitting for answers