how to do binary operation on char or hex number?

Code:

unsigned char mapa(unsigned char bits1, unsigned char bits2)
{
 printf("here3");
 if(bits1 == 0x1 && bits2 == 0x0)
   retu 0x0;
 else
   retu 0x1;
}
unsigned char* mapa2(unsigned char* bits1, unsigned char* bits2)
{
 unsigned char result[8];
 int i=0; 
 printf("here1");
 for(i=7; i>=0; --i)
 {
  result[i] = mapa(bits1[i],bits2[2]);
 }
 printf("here2");
 retu result;
}
unsigned char a1 = 0x01;
unsigned char b1 = 0x00;
int main()
{
printf("test %x",mapa2(a1,b1));
printf("test %x",mapa2(b1,a1));