refactoring generated comment (#24)

Author: h908714124

compiler/src/main/java/io/jbock/simple/processor/writing/ComponentImpl.java

@@ -92,14 +92,18 @@ TypeSpec generate() {
         }
         spec.addAnnotation(AnnotationSpec.builder(Generated.class)
                 .addMember("value", CodeBlock.of("$S", SimpleComponentProcessor.class.getCanonicalName()))
-                .addMember("comments", CodeBlock.of("$S", "https://github.com/jbock-java/simple-component " +
-                        Objects.toString(getClass().getPackage().getImplementationVersion(), "")))
+                .addMember("comments", CodeBlock.of("$S", getComments()))
                 .build());
         spec.addMethod(generateAllParametersConstructor());
         spec.addOriginatingElement(component.element());
         return spec.build();
     }
 
+    private String getComments() {
+        String version = Objects.toString(getClass().getPackage().getImplementationVersion(), "");
+        return "https://github.com/jbock-java/simple-component" + (version.isEmpty() ? "" : " " + version);
+    }
+
     private MethodSpec generateFactoryMethod(FactoryElement factory) {
         MethodSpec.Builder spec = MethodSpec.methodBuilder(FACTORY_METHOD)
                 .addModifiers(STATIC)

compiler/src/test/java/io/jbock/simple/processor/BuilderTest.java

@@ -127,7 +127,6 @@ void builderParameterIdentity() {
                         "}");
     }
 
-
     @Test
     void builderParameter() {
         JavaFileObject component = forSourceLines("test.TestClass",