code: private static String varargsRoot(final String s) {
          return s.substring(0, s.length() - (VARARGS_SUFFIX.length()));
      }
docs: Returns the root string of a varargs argument.
  <p>
  For example, for the string {@code F:myFunction...}, this method returns
  {@code F:myFunction}.
  </p>
  
  @param s {@link String}
  @return {@link String}