code: public static CharSequence getAt(CharSequence text, int index) {
          index = normaliseIndex(index, text.length());
          return text.subSequence(index, index + 1);
      }
docs: Support the subscript operator for CharSequence.
  
  @param text  a CharSequence
  @param index the index of the Character to get
  @return the Character at the given index
  @since 1.0