KotlinContraVarienceAndCovarience

    -----FRUIT BASKET--------
    
    
    -----MANGO BASKET-------- PUT ANY MEMBER TO FRUIT BASKET AS MANGO - OK, GET ANY MEMBER FROM FRUIT AS MANGO - NOT OK
    -----MANGO BASKET-------- PUT ANY MEMBER TO KESHAR-MANGO BASKET AS MANGO - NOT OK, GET ANY MEMBER FROM KESHAR-MANGO AS MANGO - OK


    -----KESHAR-MANGO BASKET--------
    
    

interface Animal{
        fun mateWith(dog: Dog)
        fun makeBaby():Dog
    }
    object Dog: Animal {
        //Doesnt support expanding input type possibilities, contraavarience
        override fun mateWith(otherAnimal: Animal) {
            
        }
        //Does support reducing output type possibilities, covarience
        override fun makeBaby(): Animal {
            return object :Animal{
                override fun mateWith(dog: Dog) {
                    
                }

                override fun makeBaby(): Dog {
                    return Dog
                }
            }
        }
    }