linked list exercise in C

list.h

// this is a header file. try to implement all the functions herein. Please labor to understand the structure of a node and try to create it on your own!
#ifndef LIST_H
#define LIST_H 1

typedef struct node node;

typedef struct node {
  int data;
  node *next;
} node;

// function prototypes/signatures
void display(node *head);
node *find(node *head, int data);
node *add_node(node *head, int data);
void free_list(node *head);
node *delete_node(node *head, node *ep);

#endif