OrderEspressoWithToppings.kt

fun main(args: Array<String>) {
    var beverage: Beverage
    beverage = Espresso()

    var beverageWithTopping = Mocha(beverage)
    //Mocha decorates Espresso 
    println("You bought ${beverageWithTopping.description} Total cost: ${beverageWithTopping.cost()}")
    
    //If we decide to add a new topping ontop of Mocha, we just need to wrap the beverageWithTopping inside the Topping e.g
    beverageWithTopping = Soya(beverageWithTopping)
    //This will give us a beverage with Soya and Mocha toppings with the descriptions and cost updated automatically.
    println("You bought ${beverageWithTopping.description} Total cost: ${beverageWithTopping.cost()}")
}