Please write ONE program containing $5$ functions. They should each match the function prototypes listed below.

void printNumsBackwards $($int start, int end$)$;

a$.$ Takes two integers, with 'start' being larger than 'end', and prints all the numbers in between. Ex$.$ printNumBackwards$(10,3)$ should print $"109876543"$

b$.$ Your program should throw an error message and let the user re$-$enter numbers until 'start' is larger than 'end'

float feet$2$meters $($float f$\_$length$)$;

a$.$ Takes a singe float representing a length in feet as a parameter, returns a float representing that same length in meters

float meters$2$feet $($float m$\_$length$)$;

a$.$ Takes a single float representing a length in meters, returns a float representing that same length in feet

b$.$ For this function, I want you to use the returned value from feet$2$meters to verify that your math is being done correctly

int factorial $($int n $)$;

a$.$ Takes a single integer $\text{'}n\text{'}$ and returns the factorial of that number. Ex$.$ factorial$(4)$ should return $24$

float average $($int a$,$ int b$,$ int c$)$;

a$.$ Takes $3$ integers and returns the average of the three as a float. Ex$.$ average$(10,20,40)$ should return $23\mathrm{.}33333...$

Next write a main function which demonstrates that all $6$ are working properly by calling each of them with user$-$supplied values $($via scanf$)$ and printing the results.

I would like the main to be structured where you scan in values for the function $($except meters$2$feet$),$ run the function, and print the output before moving onto the next function. You should ONLY be doing scanf inside of main$(),$ not in the functions. The ONLY function that should contain a printf$()$ is printNumBackwards.