singly insertion at end

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

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

void CreateNode(struct node **p, int value)
{
    struct node *ptr = (struct node *)malloc(sizeof(struct node *));
    ptr->data = value;
    ptr->next = *p;
    *p = ptr;
}

void Disp(struct node *p)
{
    struct node *temp = p;
    while (temp != NULL)
    {
        printf("Element is : %d\n", temp->data);
        temp = temp->next;
    }
    printf("NULL");
}

void InsertAtEnd(struct node **head, int value)
{
    struct node *ptr = (struct node *)malloc(sizeof(struct node *));
    ptr->data = value;
    struct node *p = *head;
    while (p->next != NULL)
    {
        p = p->next;
    }
    p->next = ptr;
    ptr->next = NULL;
}

void InsertAtIndex(struct node **head, int value, int index)
{
    int i = 0;
    struct node *ptr = (struct node *)malloc(sizeof(struct node *));
    struct node *p = *head;
    while (i != index - 1)
    {
        p = p->next;
        i++;
    }
    ptr->data = value;
    ptr->next = p->next;
    p->next = ptr;
}

int main()
{
    int i = 0, choice, value, index;
    struct node *head = NULL;

    CreateNode(&head, 12);
    CreateNode(&head, 13);
    CreateNode(&head, 14);

    printf("Enter 1.Create a linked list \n2.To create a node \n3.To insert node at the end \n4.Insert node at index \n5.To display linked list \n6.To execute program : ");

    do
    {
        printf("\nEnter the choice : ");
        scanf("%d", &choice);
        switch (choice)
        {
        case 2:
            printf("Enter the data : ");
            scanf("%d", &value);
            CreateNode(&head, value);
            break;
        case 3:
            printf("Enter the data : ");
            scanf("%d", &value);
            InsertAtEnd(&head, value);
            break;
        case 4:
            printf("Enter the data : ");
            scanf("%d", &value);
            printf("Enter the index : ");
            scanf("%d", &index);
            InsertAtIndex(&head, value, index);
            break;
        case 5:
            Disp(head);
            break;
        case 6:
            exit(0);
            break;

        default:
            break;
        }

    } while (choice != 6);

    return 0;
}