#include "linked_list.h"

/* create a new node */
/* returns a pointer to the newly created node */
/* print an error message and return NULL if an error occurs */
Node *initialise_node(void)
{
}

/* free memory for node *node */
/* print an error message and return if node is NULL */
void free_node(Node *node)
{
}

/* create a new linked list */
/* returns a pointer to the newly created list */
/* print an error message and return NULL if an error occurs */
LinkedList *initialise_linked_list(void)
{
}

/* free memory for linked list *list */
/* frees memory for all nodes in linked list and list itself */
/* print an error message and return if list is NULL */
void free_linked_list(LinkedList *list)
{
}

/* create and add node to the tail of linked list *list */
/* and set data stored at node to *data */
/* should return a pointer to the new node */
/* should return NULL if an error occurs */
Node *append_linked_list(LinkedList *list, void *data)
{
}

/* create and add node to the head of linked list *list */
/* and set data stored at node to *data */
/* should return a pointer to the new node */
/* should return NULL if an error occurs */
Node *prepend_linked_list(LinkedList *list, void *data)
{
}

/* remove head from linked list *list */
/* print an error message and return if list is NULL or empty */
void remove_head_linked_list(LinkedList *list)
{
}

/* remove tail from linked list *list */
/* print an error message and return if list is NULL or empty */
void remove_tail_linked_list(LinkedList *list)
{
}

/* print data stored in linked list *list to stdout */
/* prints data from head to tail */
/* prints each node data on a newline */
/* user gives pointer to function *print_func which is called to print data */
/* print an error message and return if list or print function is NULL */
/* don't print anything if the list is empty */
void print_linked_list(LinkedList *list, void (*print_func)(void *))
{
}

/* print char pointed to by *ptr to stdout */
void print_char(void *ptr)
{
}

/* print int pointed to by *ptr to stdout */
void print_int(void *ptr)
{
}

/* print double pointed to by *ptr to stdout */
void print_double(void *ptr)
{
}

/* print a string pointed to by *ptr to stdout */
void print_string(void *ptr)
{
}