update: interfaces

interfaces/04-interfaces/book.go

@@ -1,24 +0,0 @@
-// For more tutorials: https://blog.learngoprogramming.com
-//
-// Copyright © 2018 Inanc Gumus
-// Learn Go Programming Course
-// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
-//
-
-package main
-
-import "fmt"
-
-type book struct {
-	title string
-	price float64
-}
-
-func (b book) print() {
-	fmt.Printf("%-15s: $%.2f \n", b.title, b.price)
-}
-
-// TODO: NEW
-func (b book) total() float64 {
-	return b.price
-}