The Language is DrRocket, please help me

A car coin holder holds a finite number of nickels, a finite number of dimes, and a finite number of quarters at any given time. Three constants are defined below for the maximum number of each coin that can be held by a car coin holder. Implement a car coin holder and implement the following functions on a car coin holder: total: Given a car coin holder, the total number of coins contained is returned. store: Takes as input a car coin holder, the type of coin being stored, and the number of coins being added to the coin holder. If the coin holder can hold the coins being stored, then a new coin holder containing the given number coins is returned. Otherwise, the given car coin holder is returned. A car coin holder holds a finite number of nickels, a finite number of dimes, and a finite number of quarters at any given time. Three constants are defined below for the maximum number of each coin that can be held by a car coin holder. Implement a car coin holder and implement the following functions on a car coin holder: total: Given a car coin holder, the total number of coins contained is returned. store: Takes as input a car coin holder, the type of coin being stored, and the number of coins being added to the coin holder. If the coin holder can hold the coins being stored, then a new coin holder containing the given number coins is returned. Otherwise, the given car coin holder is returned