OpenAIService.close method declared with parentheses

openai-client/src/main/scala/io/cequence/openaiscala/service/ws/WSHelper.scala

@@ -36,6 +36,6 @@ trait WSHelper {
     client
   }
 
-  def close =
+  def close(): Unit =
     client.close()
 }

openai-core/src/main/scala/io/cequence/openaiscala/service/OpenAIMultiServiceAdapter.scala

@@ -16,7 +16,7 @@ private trait OpenAIMultiServiceAdapter extends OpenAIServiceWrapper {
     fun(underlyings(calcIndex))
 
   override def close =
-    underlyings.foreach(_.close)
+    underlyings.foreach(_.close())
 }
 
 private class OpenAIMultiServiceRotationAdapter(

openai-core/src/main/scala/io/cequence/openaiscala/service/OpenAIRetryServiceAdapter.scala

@@ -23,8 +23,8 @@ private class OpenAIRetryServiceAdapter(
     )
   }
 
-  override def close =
-    underlying.close
+  override def close(): Unit =
+    underlying.close()
 
   private def retry[T](
     failureMessage: String)(

openai-core/src/main/scala/io/cequence/openaiscala/service/OpenAIService.scala

@@ -351,5 +351,5 @@ trait OpenAIService extends OpenAIServiceConsts {
   /**
    * Closes the underlying ws client, and releases all its resources.
    */
-  def close: Unit
+  def close(): Unit
 }

openai-guice/src/main/scala/io/cequence/openaiscala/service/OpenAIExampleApp.scala

@@ -5,7 +5,7 @@ object OpenAIExampleApp extends BaseOpenAIClientApp {
   openAIService.listModels.map(
     _.foreach(println)
   ).onComplete { _ =>
-    openAIService.close
+    openAIService.close()
     system.terminate
     System.exit(0)
   }