Write a function $`$delete$\_$present$\_$list$`$ to free all memory allocated for an array of

structures containing dynamically allocated strings and return a null pointer.

Function Signature:c

struct present$*$ delete$\_$present$\_$list$($struct present$*$ present$\_$list, int num$)$;

Structure Definition:

struct present $\{$

char $*$present$\_$name;

float price;

$\}$;

Sample Edge Cases:

Null Pointer for present$\_$list:

$$ When passed to the function, the present$\_$list is NULL. The function should gracefully handle

this case by returning NULL immediately.

Zero Presents $($num $=0)$:

$$ The num parameter is $0,$ indicating no presence in the list. The function should handle this

case without attempting to access or free any memory.

Null Pointers within present$\_$list:

$$ Some present$\_$name pointers within the present$\_$list array are NULL. The function

should check each present$\_$name before attempting to free it$.$

Memory Allocation Failures $($Hypothetical$)$:

$$ While this isn't typically part of a deletion function, consider what might happen if

present$\_$name allocations had failed during the list's creation. This might require handling

NULL pointers within the array