pub struct Cat{
    color:(u8,u8,u8),

}
pub struct Dog{
    color:(u8,u8,u8),
}

pub trait Speaker {
     fn speak(&self) -> ();
 }



impl Speaker for Cat {
     fn speak(&self) {
           println!("meow!");
     }
 }

 impl Speaker for Dog {
     fn speak(&self) {
           println!("woof!");
     }
 }
 // fn speak<S: Speaker>() {
//    self.speak();
//}


pub  fn notify<S: Speaker>(speaker: S) {
        speaker.speak();
}

fn main(){
    let cat1 = Cat{color:(30,30,30)};
    let dog1 = Dog{color:(30,30,30)};
    cat1.speak();
    dog1.speak();
    notify(cat1);
}