Modularize the source code.

This makes greeting generation separate from greeting output, which
makes it easier to unit-test greeting generation.

Change-Id: Ice07f45ed0e9274bd4d4b3cd031cb37fffd34a5e
diff --git a/Jenkinsfile b/Jenkinsfile
index 5590199..fc6bb76 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -43,7 +43,7 @@
     stage('Archive artifacts') {
       steps {
         container('baker') {
-          archiveArtifacts 'hello-world-ng'
+          archiveArtifacts 'exe/hello-world-ng'
         }
       }
     }