Thread: working with void stars???

I really dont understand the typecasting part of this... Im getting alot of errors..
Can anyone tell me why and how I can fix it?

** I have to use the void stars..

Code:

typedef struct _stacknode{
    void *value;
    struct _stacknode *next;
    struct _stacknode *prev;
}STACKNODE;

typedef struct _stack{
    struct _stacknode *sent;
}STACK;

void push(void *value, void *stack)
{
    STACK *new_node;
    new_node = (STACK *)malloc(sizeof(STACK));
    stack->prev->next = new_node;
    new_node->prev = stack->prev;
    stack->prev = new_node;
    new_node->next = stack;

}