anchor.diff:  
   Maven has generated a `greeting-extension` directory containing the extension project which consists of the parent `pom.xml`, the `runtime` and the `deployment` modules.
   
  -=== The parent pom.xml
  +==== The parent pom.xml
   
   Your extension is a multi-module project. So let's start by checking out the parent POM at `./greeting-extension/pom.xml`.
   
  
positive.code:         <groupId>io.quarkus</groupId>
          <artifactId>quarkus-undertow</artifactId>
      </dependency>
  ----
  
  NOTE: The dependency on `quarkus-arc` generated by the `create-extension` mojo can now be removed since
  
negative.code: ----
  NOTE: The dependency on `quarkus-arc-deployment` generated by the `create-extension` mojo can now be removed since
  `quarkus-undertow-deployment` already depends on it.
  
  For Gradle, add the dependency in `./greeting-extension/deployment/build.gradle` file:
  
  [source, groovy]
  ----
      implementation 'io.quarkus:quarkus-undertow-deployment'
  ----
  
  We can now update `org.acme.greeting.extension.deployment.GreetingExtensionProcessor`:
  
  