Merge pull request #588 from avaje/feature/jexRootPath

[jex generation] Root path generated as "/" rather than ""

Author: SentryMan

http-generator-jex/src/main/java/io/avaje/http/generator/jex/ControllerMethodWriter.java

@@ -43,7 +43,10 @@ private void validateFilter() {
 
   void writeRouting() {
     final PathSegments segments = method.pathSegments();
-    final String fullPath = segments.fullPath();
+    String fullPath = segments.fullPath();
+    if (fullPath.isEmpty()) {
+      fullPath = "/";
+    }
 
     if (method.isErrorMethod()) {
       writer.append("    routing.error(%s.class, this::_%s", method.exceptionShortName(), method.simpleName());