Polish "Fix Jackson module groupId added to dependencies"

See gh-1733

Author: mhalbritter

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/code/kotlin/KotlinJacksonBuildCustomizer.java

@@ -37,12 +37,12 @@
  */
 public class KotlinJacksonBuildCustomizer implements BuildCustomizer<Build> {
 
+	private static final VersionRange SPRING_BOOT_4_OR_LATER = VersionParser.DEFAULT.parseRange("4.0.0");
+
 	private final BuildMetadataResolver buildMetadataResolver;
 
 	private final ProjectDescription description;
 
-	private static final VersionRange SPRING_BOOT_4_OR_LATER = VersionParser.DEFAULT.parseRange("4.0.0");
-
 	public KotlinJacksonBuildCustomizer(InitializrMetadata metadata, ProjectDescription description) {
 		this.buildMetadataResolver = new BuildMetadataResolver(metadata, description.getPlatformVersion());
 		this.description = description;
@@ -52,11 +52,14 @@ public KotlinJacksonBuildCustomizer(InitializrMetadata metadata, ProjectDescript
 	public void customize(Build build) {
 		boolean isKotlin = ClassUtils.isAssignableValue(KotlinLanguage.class, this.description.getLanguage());
 		if (this.buildMetadataResolver.hasFacet(build, "json") && isKotlin) {
-			String groupId = SPRING_BOOT_4_OR_LATER.match(this.description.getPlatformVersion())
-					? "tools.jackson.module" : "com.fasterxml.jackson.module";
+			String groupId = isBoot4OrLater() ? "tools.jackson.module" : "com.fasterxml.jackson.module";
 			build.dependencies()
 				.add("jackson-module-kotlin", groupId, "jackson-module-kotlin", DependencyScope.COMPILE);
 		}
 	}
 
+	private boolean isBoot4OrLater() {
+		return SPRING_BOOT_4_OR_LATER.match(this.description.getPlatformVersion());
+	}
+
 }