Write program to add BCD 67 and 25 and show result (92) at DP0,DP1 of Line-1 of LCD

Write program to add BCD 67 and 25 and show result (92) at DP0,DP1 of Line-1 of LCD

#include <Arduino.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);

void setup()
{
byte x1=0x67;
byte x2=0x25;

lcd.begin(16,2);
lcd.clear();
lcd.setCursor(5,1);

byte x1low=x1>>0;
x1low=x1low&0x0F; /// lower 4 bits of x1

byte x2low=x2>>0;
x2low=x2low&0x0F;/// lower 4 bit of x2

bool HalfCarry=bitRead(x1low+x2low,4);

int z=x1+x2;

bool FullCarry=bitRead(z,8);

byte zu=z>>4;
zu=zu&0x0F; ///upper 4 bits of z

byte zl=z>>0;
zl=zl&0x0F; ///LOWER 4 bits of z


if(zl>9) ///if lower 4 bit is greater than 9, add 0x06
{
    z=z+0x06;
}


if (zu>9)  ///if upper 4 bit is greater than 9, add 0x60
{
    z=z+0x60;
}


if (HalfCarry == 1) /// if half Carry present, Add 0x06
{
   z=z+0x06;
}


if (FullCarry== 1) /// if full Carry present, Add 0x60
{
    z=z+0x60;
}


lcd.print(z,HEX);
}

void loop()
{

}