Go Interface working sample

inteface.go

package main

import (
    "fmt"
)

type Common struct {
    s string
}

type Object interface {
    GetCommon() (*Common)
}

type Test struct{
    c *Common
}

func (t *Test) GetCommon() (*Common) {
    return t.c
}

func Show(o Object) {
    fmt.Println(o.GetCommon().s)
}

func NewCommon(text string) (*Common){
    return &Common{text}
}

func main(){
    c := NewCommon("test")
    t := Test{c}
    Show(&t)
}