class delegation in Kotlin

```
interface AttackType {
    fun getAttackType(): String
}

class Ranged : AttackType {
    override fun getAttackType(): String = "Ranged"
}

interface HeroType {
    fun getAttributeType(): String
}

class Strength : HeroType {
    override fun getAttributeType(): String = "Strength"
}

class Huskar : AttackType by Ranged(), HeroType by Strength()
```