code: public static int indexOf(final CharSequence cs, final char searchChar, int start) {
          if (cs instanceof String) {
              return ((String) cs).indexOf(searchChar, start);
          } else if (cs instanceof AsciiString) {
              return ((AsciiString) cs).indexOf(searchChar, start);
          }
          if (cs == null) {
              return INDEX_NOT_FOUND;
          }
          final int sz = cs.length();
          for (int i = start < 0 ? 0 : start; i < sz; i++) {
              if (cs.charAt(i) == searchChar) {
                  return i;
              }
          }
          return INDEX_NOT_FOUND;
      }
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