package main

import "fmt"

type Speaker interface {
  Speak() string
}

type cat struct {
  name string
}

func catDetails(c cat) {
  fmt.Printf("(%v, %T)\n", c, c)
}

func emptyDetails(s interface{}) {
  fmt.Printf("(%v, %T)\n", s, s)
}

func main() {

  c := cat{"oreo"}
  i := 99
  b := false
  str := "test"
  catDetails(c)
  emptyDetails(c)
  emptyDetails(i)
  emptyDetails(b)
  emptyDetails(str)

}