protocol_05.swift

func makeSmoothie(with ingredients: [Blendable]) {
    for ingredient in ingredients {
        ingredient.blend()
    }
}

let orange = Fruit(name: "Orange")
let strawberry = Fruit(name: "Strawberry")
let chocolateMilk = Milk(name: "Chocolote")

//This will work perfectly
let ingredients: [Blendable] = [strawberry, chocolateMilk, orange]


makeSmoothie(with: ingredients)


let cheddar = Cheese(name: "Cheddar")

//This will give an error because cheddar 
let ingredients: [Blendable] = [strawberry, chocolateMilk, cheddar]
makeSmoothie(with: ingredients)