Migrated scala-lang-2 to scala3

Author: yadavan88

build.sbt

@@ -137,7 +137,8 @@ lazy val scala_lang = (project in file("scala-lang-modules/scala-lang"))
 
 lazy val scala_lang_2 = (project in file("scala-lang-modules/scala-lang-2"))
   .settings(
-    name := "scala-lang",
+    name := "scala-lang-2",
+    scalaVersion := scala3Version,
     libraryDependencies ++=
       Seq(jUnitInterface) ++ scalaTestDeps
   )

scala-lang-modules/scala-lang-2/src/main/scala-2/com/baeldung/scala/inheritance/Hierarchical.scala renamed to scala-lang-modules/scala-lang-2/src/main/scala/com/baeldung/scala/inheritance/Hierarchical.scala

@@ -9,7 +9,7 @@ object UnitReturnType extends App {
   }
   println("result of function returning Unit: %s".format(functionReturnUnit))
 
-  def functionReturnImplicitUnit {
+  def functionReturnImplicitUnit: Unit = {
     s"""
       do something, don't return anything
     """