code: protected void removeFile(String subdir, String filename) throws IOException {
          Path dir = root;
          if (subdir != null) {
              dir = dir.resolve(subdir);
          }
          Files.deleteIfExists(dir.resolve(filename));
      }
docs: Remove a file from ~/.fscrawler/{subdir} dir
  @param subdir subdir where we can read the file (null if we read in the root dir)
  @param filename filename
  @throws IOException in case of error while reading