code: public static String toColorShorthandWithAlpha(String red, String green,
  			String blue, String alpha) {
  		return shorthandHex(toColorWithAlpha(red, green, blue, alpha));
  	}
docs: Convert the hex color values to a hex color, shorthanded when possible
  
  @param red
  red hex color in format RR or R
  @param green
  green hex color in format GG or G
  @param blue
  blue hex color in format BB or B
  @param alpha
  alpha hex color in format AA or A, null to not include alpha
  
  @return hex color in format #ARGB, #RGB, #AARRGGBB, or #RRGGBB