C Programming computer science homework help

Consider the following program fragment that defines a self‐referential type:

//Start of code

#include <stdbool.h>

#include <stdlib.h>

struct node_int;

typedef struct node_int *node;

struct node_int

{

int data;

node next;

};

typedef struct list_int {node first;} *list;

…

int f1(list l)

{

node c=l->first;

int s=0;

while (c != NULL)

{

s=s + l->first;

c=c->next;

}

return s;

}

//End of code

Question 1: Thoroughly explain what does the function f1() do (or should do if it were free of errors)?

Question 2: Describe possible problems with the code of the function f1().