package main

import "fmt"

func main() {
	a := A{}
	a.N = "hello"
	fmt.Println(a.Method.O("world"))
	fmt.Println(a.Method.I("whatup!"))
	fmt.Println(a.Method.F("wtf?"))

}

type A struct {
	N      string
	Method methods
}

type methods struct{}

func (m methods) O(x string) string { return fmt.Sprintf("%s_O", x) }
func (m methods) I(x string) string { return fmt.Sprintf("%s_I", x) }
func (m methods) F(x string) string { return fmt.Sprintf("%s_F", x) }