code: public static String expandShorthandHexSingle(String color) {
  		validateHexSingle(color);
  		if (color.length() == 1) {
  			color += color;
  		}
  		return color;
  	}
docs: Expand the hex single if it is in shorthand
  
  @param color
  hex single color
  @return expanded hex color or original value