//This is the header file for linked lists
//Inlcude any function prototypes here
//#defines, and any comments

//Helper functions
//TODO: Fill in the output and inputs to complete prototypes
struct node *create_node(int data, struct node *next);
void print_list(struct node *head);
int sum_list(struct node *head);
int sum_list_recursive(struct node *head);
void print_list_recursive(struct node *head);
struct node *insert_end(struct node *head, int data);
struct node *insert_endnode(int data, struct node *head);