CenterMessage opt and fix

public static String centerMessage(String message){
        if(message == null || message.equals("")) return "";
        message = ChatColor.translateAlternateColorCodes('&', message);

        int messagePxSize = 0;
        boolean previousCode = false;
        boolean isBold = false;

        for(char c : message.toCharArray()){
            if(c == ChatColor.COLOR_CHAR){//much safer
                previousCode = true;
            }else if(previousCode){
                previousCode = false;
                char nc = Character.toLowerCase(c);
                if(!isBold)
                    if(nc == ChatColor.BOLD.getChar())
                        isBold = true;
                else
                    if(nc == ChatColor.RESET.getChar())
                        isBold = false;
            }else{
                DefaultFontInfo dFI = DefaultFontInfo.getDefaultFontInfo(c);
                messagePxSize += isBold ? dFI.getBoldLength() : dFI.getLength();
                messagePxSize++;
            }
        }

        int halvedMessageSize = messagePxSize / 2;
        int toCompensate = CENTER_PX - halvedMessageSize;
        int spaceLength = DefaultFontInfo.SPACE.getLength() + 1;

        StringBuilder sb = new StringBuilder((int) (Math.ceil((float)toCompensate/spaceLength) + message.length()));//some optimization
        for(int i = 0; i < toCompensate; i += spaceLength)
            sb.append(" ");
        return  sb.append(message).toString();
    }