typedef struct STACK_EL
{
    struct node *array;
    struct STACK_EL *prev;
}STACK_EL;


STACK_EL *top_stack;



void stc_push(node *tmp_array)
{

    STACK_EL *temp=malloc(sizeof(STACK_EL));

    temp->array=tmp_array;
    temp->prev=NULL;

        temp->prev=top_stack;
        top_stack=temp;
}




node *stc_pop()
{
    node *temp;
    temp=top_stack->array;

    STACK_EL *tmp_el;
    tmp_el=top_stack;

    top_stack=top_stack->prev;

    free(tmp_el);

    return temp;
}