pub trait FirstTrait {
    fn first_fn(&self, first_struct: Rc<RefCell<dyn FirstTrait>>);
}
pub trait SecondTrait: FirstTrait {
    fn second_fn(&self);
}

pub struct FirstStruct {}
impl FirstTrait for FirstStruct {
    fn first_fn(&self, first_struct: Rc<RefCell<dyn FirstTrait>>) {}
}

pub struct SecondStruct {}
impl FirstTrait for SecondStruct {
    fn first_fn(&self, first_struct: Rc<RefCell<dyn FirstTrait>>) {}
}
impl SecondTrait for SecondStruct {
    fn second_fn(&self) {}
}

fn main() {
        let first_struct: Rc<RefCell<dyn FirstTrait>> = Rc::new(RefCell::new(FirstStruct {}));
        let second_struct: Rc<RefCell<dyn SecondTrait>> = Rc::new(RefCell::new(SecondStruct {}));

        first_struct.borrow_mut().first_fn(Rc::clone(&second_struct));
}