class A {

	val b: B
	val c: String = ""

	fun a(value: Int) {
		b.doSomething(
		value,
		{
			c = it + "result good"
		},{
			c = it + "result bad"
		})
	}
}

class B {
 fun doSomething(
 	value: Int,
 	good: (String) -> Unit,
 	bad: (String) -> Unit,
 ) {
 	if (value != 0) {
 		good(value.toString)
 	} else {
 		bad("value must be not zero!")
 	}
 }
}

fun main() {
	A a = A(B())
	a.a(13)
	print(a.c)
}