Step $3$: In the main section of the code, prompt the user for a customer's name and today's date. Output the name and date. Create an object of type ShoppingCart. $(1$ pt$)$

Step $4$: Implement the following menu functions

print$\_$menu$()$

Prints the following menu of options to manipulate the shopping cart. $(1$ pt$)$

MENU a $-$ Add item to cart r $-$ Remove item from cart c $-$ Change item quantity i $-$ Output items' descriptions o $-$ Output shopping cart q $-$ Quit

execute$\_$menu$()$

Takes $2$ parameters: a character representing the user's choice and a shopping cart. Performs the menu options described below in step $5,$ according to the user's choice. $(1$ pt$)$

Step $5$: Implement the menu options

Step $5$a: In the main section of the code, call print$\_$menu$()$ and prompt for the user's choice of menu options. Each option is represented by a single character.

If an invalid character is entered, continue to prompt for a valid choice. When a valid option is entered, execute the option by calling execute$\_$menu$().$ Then, print the menu and prompt for a new option. Continue until the user enters $\text{'}$q$\text{'}.(1$ pt$)$

Step $5$b: Implement "Output shopping cart" menu option in execute$\_$menu$().(3$ pts$)$

Step $5$c: Implement "Output items' descriptions" menu option in execute$\_$menu$().(2$ pts$)$

Step $5$d: Implement "Add item to cart" menu option in execute$\_$menu$().(3$ pts$)$

Step $5$e: Implement "Remove item from cart" menu option in execute$\_$menu$().(4$ pts$)$

Step $5$f: Implement "Change item quantity" menu option in execute$\_$menu$().(5$ pts$)$