Converter:

Omit Unit return type
Refactor handling of Unit type: extract separate object UnitType

j2k/tests/testData/ast/newClassExpression/newStaticInnerClass.kt

@@ -6,7 +6,7 @@ open class Bar() {
 }
 }
 open class User() {
-open fun main() : Unit {
+open fun main() {
 var boo : Foo.Bar? = Foo.Bar()
 }
 }