Fix arialdomartini#44 - using equals() rather than ==

Author: arialdomartini

README.md

@@ -403,7 +403,7 @@ public class TheService {
         final String rewrittenUrl = fileHandler.getXmlFileFromFileName(file);
         final String executionId = fileHandler.getExecutionIdFromFileName(file);
 
-        if ((executionId == "") || (rewrittenUrl == "")) {
+        if (executionId.equals("") || rewrittenUrl.equals("")) {
             return "";
         }