code: public void toNormalImage(File src, File dest) {
          String command = commandDir + (dest.getName().endsWith(".gif") ? "/gif2webp" : "/dwebp ") + src.getPath() + " -o " + dest.getPath();
          this.executeCommand(command);
      }
docs: Converter webp file to normal image
  
  @param src  webp file path
  @param dest normal image path