typedef struct {

int *elems; // Pointer to backing array.

int capacity; // Maximum number of elements in the list.

int size; // Current number of elements in the list.

} intlist_t;

File array_ list.c contains an incomplete definition of a function named intlist_index. This function returns the index (position) of the first occurrence of an integer in a list. The function prototype is int intlist index(const intlist t *list, int target) This function should terminate (via assert) if parameter list is NULL. If target is in the list, the function should return the index of the first occurrence. If target is not in the list, the function should return -1