vw tx working

//Transmitter Code (Uno)
#include <VirtualWire.h>
int red, green, blue;
String RGB;
char cRGB[8];

void setup()
{
  Serial.begin(9600);
  int red = 255;
  int blue = 255;
  int green = 255;
  vw_setup(4000);
  vw_set_tx_pin(7);
}

void loop()
{
  //protocol expects data in format of 4 bytes
  //(xff) as a marker to ensure proper synchronization always
  //followed by red, green, blue bytes
    if (Serial.available()>=4)
  {
  if(Serial.read() == 0xff)
    {
  red = Serial.read();
  green= Serial.read();
  blue = Serial.read();
    }
  }
//here is my shitty way to convert the rgb into a hex color
  RGB = "F"; //starting with "F" (easier to un-hex for the receiver)
if (red<=16){
  RGB += "0"+String(red,HEX);}
  else if (red>16){RGB+=String(red,HEX);}
if (green<=16){
  RGB += "0"+String(green,HEX);}
  else if (green>16){RGB+=String(green,HEX);}
if (blue<=16){
  RGB += "0"+String(blue,HEX);}
  else if (blue>16){RGB+=String(blue,HEX);}
// example of end result from the rgb color (10,10,10) = F0A0A0A


  RGB.toCharArray(cRGB,8);

      vw_send((uint8_t *)cRGB, 8);
}