Update and refactoring

Author: Yauhenikapl

core/esmf-aspect-model-aas-generator/src/main/java/org/eclipse/esmf/aspectmodel/aas/AasToAspectModelGenerator.java

@@ -195,7 +195,7 @@ private String iriToReversedHostNameNotation( final IRI iri ) {
             .filter( StringUtils::isNotBlank )
             .collect( Collectors.joining( "." ) );
 
-      return reversedHost + "." + path;
+      return reversedHost + ( path.isEmpty() ? "" : "." + path );
    }
 
    private Optional<IRI> iri( final String lexicalRepresentation ) {

core/esmf-aspect-model-aas-generator/src/test/java/org/eclipse/esmf/aspectmodel/aas/AasToAspectModelGeneratorTest.java

@@ -36,11 +36,10 @@
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.EnumSource;
 
-public class AasToAspectModelGeneratorTest {
+class AasToAspectModelGeneratorTest {
 
-   // IDTA-provided sample files can currently not be read with AAS4J
    @Test
-   @Disabled
+   @Disabled( "IDTA-provided sample files can currently not be read with AAS4J" )
    void testTranslateDigitalNameplate() {
       final InputStream aasx = AasToAspectModelGeneratorTest.class.getClassLoader()
             .getResourceAsStream( "Sample_ZVEI_Digital_Nameplate_V10.aasx" );