Create a C$++$ program that contains the following functions:

a$.$ void displayCarDetails$($string$[],$ double$[],$ int$)$: This function takes two parallel arrays $($cars and mpg$)$ and their size as input. It displays the car details, including car name, MPG$,$ and whether it is "Economical" or a "Gas Guzzler" based on its MPG value.

Pre$-$populate two parallel arrays with $5$ elements each:

a$.$ cars$[]$: This string array will hold the names of $5$ cars $($e$.$g$.,$ "Car A$",$ "Car B$",$ etc.$).$

b$.$ mpg$[]$: This double array will hold the MPG values of the corresponding cars.

Use the displayCarDetails function to output the car details.

The program should calculate whether a car is "Economical" or a "Gas Guzzler" based on the following rule:

If the MPG is greater than $30\mathrm{.}0,$ the car is considered "Economical."

Otherwise, the car is considered a "Gas Guzzler."

add a function that returns the average mpg of all $5$ cars