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package main

import "fmt"

type interfacer interface {
	interfaceWithMe(string) string
}

type goodInterfacer struct{}

func (goodInterfacer) interfaceWithMe(s string) string {
	return s
}

type badInterfacer struct{}

func (badInterfacer) dontInterfaceWithMe(s string) string {
	return s
}

func main() {
	fmt.Println(useMe(goodInterfacer{}, "Hello"))
	fmt.Println(useMe(badInterfacer{}, "World"))
}

func useMe(i interfacer, s string) string {
	return i.interfaceWithMe(s)
}