Linked List Append

/*
   Linked List
   Append()
*/

#include <stdio.h>
#include <stdlib.h>

struct Node
{
    int data;
    struct Node *next;
};

typedef struct Node node;

node *head = 0;

void append(int data)
{
    if(head == 0)
    {
        head = (node*)malloc(sizeof(node));
        head->data = data;
        head->next = 0;
    }
    else
    {
        node *temp = (node*)malloc(sizeof(node));
        temp = head;
        while(temp->next != 0)
        {
            temp = temp->next;
        }
        node *new = (node*)malloc(sizeof(node));
        new->data = data;
        new->next = 0;
        temp->next = new;
    }
}
void display()
{
    node *temp = (node*)malloc(sizeof(node));
    temp = head;
    while(temp->next != 0)
    {
        printf("%d\n", temp->data);
        temp = temp->next;
    }
    printf("%d\n", temp->data);
}

int main()
{
    append(4);

    append(5);

    append(6);

    display();
}