Decorator Pattern: Coffee Customisation

Problem

Design a coffee ordering system where a base Coffee can be decorated with add-ons (Milk, Sugar, Whip, VanillaSyrup) at runtime. Each add-on wraps the base object, adding to the cost and description — without creating a class explosion of MilkSugarWhipCoffee, MilkCoffee, etc.

Requirements

Coffee interface with: getDescription(): string, getCost(): number
SimpleCoffee (base): 'Coffee', ₹50
MilkDecorator: wraps any Coffee, adds 'Milk' to description, +₹15
SugarDecorator: wraps any Coffee, adds 'Sugar', +₹5
WhipDecorator: wraps any Coffee, adds 'Whip', +₹20
Show: SimpleCoffee → add Milk → add Whip → add Sugar = correct total and description
Decorators can be stacked in any order

Constraints

–No subclass for each combination (no MilkWhipCoffee class)
–Each decorator must accept ANY Coffee (including another decorator)

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