Write a function in c$,$ called age$\_$difference$()$ that takes two Person variables as parameters and returns the difference in age in years as an integer.

Suppose that Person is defined as follows:

typedef struct$\{$

char name$[50]$;

int birth$\_$year;

$\}$ Person;

If two people were defined as

Person y $=\{"$Greg$",1972)$;

Person b $=\{"$Anthony$",1963)$;

Then age$\_$difference$($y$,$ b$)$ should return $9.$ age$\_$difference should always return a positive value or zero.

Please note: you should not write a main$()$ function. Assume that all necessary #include statements, the main function, and the printf statements to display output have all been implemented. You should write only the age$\_$difference function.