docs: private static String getNormalizedParent(String filePath) {
          if (new File(filePath).getParent() == null) {
              // parent doesn't exist .. return null
              return null;
          }
  
          String parentDir = filePath.substring(0, filePath.lastIndexOf("/"));
  
          if (!parentDir.contains("/")) {
              //catch cases where filePath is something like C:/temp.zip or /home.zip
              parentDir = parentDir + "/";
          }
  
          return parentDir;
      }