Migrated scala-core-8 to scala3

Author: yadavan88

build.sbt

@@ -101,6 +101,7 @@ lazy val scala_core_8 = (project in file("scala-core-modules/scala-core-8"))
   .settings(
     name := "scala-core-8",
     libraryDependencies ++= scalaTestDeps,
+    scalaVersion := scala3Version,
     libraryDependencies += "org.scala-lang.modules" %% "scala-java8-compat" % "1.0.2",
     libraryDependencies += "com.typesafe" % "config" % "1.2.1"
     // scalacOptions += "-Ymacro-debug-lite"

scala-core-modules/scala-core-8/src/main/scala/com/baeldung/scala/builderpattern/GuitarBuilder.scala

@@ -31,3 +31,6 @@ case class GuitarBuilder private (
     delay = delay
   )
 }
+object GuitarBuilder {
+  def apply(): GuitarBuilder = new GuitarBuilder()
+}