call a function inside struct but struct inside a void*

Can I first allocate a struct (with a function inside) to a void* and trigger the function inside them.

struct func {
    void (*fp)(); // this is a function
};

struct thread{
    void *stack; // I'm gonna use this to store 'struct func' above
};

void assign(struct thread *t,void *f()){
    struct func *task = (struct func *)malloc(sizeof(struct func));
    task->fp = f;
    t->stack = task;
    
    // question: now I want to call the function inside func and deeper inside void*
    // I mean: trigger the function fp()
    t->stack->fp(); // error here

}

>Solution :

The stack member has type void * and therefore can’t be dereferenced as is.

You would first need to cast it to the proper pointer type (or assign to a pointer of that type) before dereferencing.

((struct func *)t->stack)->fp();
// or
struct func *f = t->stack;
f->fp();