TypingSystem.kt

fun processPerson(person: Person?) {
    val name = person?.name ?: return
    val surname = 
            if(person.surname.isNotBlank()) person.surname 
            else return
    //...
}

fun describeNormalNum(num: Int) {
    val description = when {
        num % 2 == 0 -> "Is even"
        num % 2 == 1 -> "Is odd"
        else -> return
    }
    print(description)
}