Shift register reading

#define CLOCK 2
#define DATA 3

volatile int master_count = 0; // universal count

volatile uint8_t in_buffer = 0;

bool secondByte = false;

int readingOffset = 2;

const byte numTable[] =
{
  B00000011, //0
  B11111001, //1
  B11010010, //2
  B11101000, //3
  B10011001, //4
  B01001001, //5
  B01000001, //6
  B11111000, //7
  B10000000, //8
  B11111000 //9
};


void setup() {
   pinMode(DATA, INPUT_PULLUP);
   pinMode(CLOCK,INPUT);

   Serial.begin(250000);
   Serial.println("Ready for sniffing...");
}

void loop() {

  delayMicroseconds(300);

  master_count = 0;
  in_buffer = 0;

 attachInterrupt(digitalPinToInterrupt(CLOCK), interrupt, RISING);
 // interrupt 0 digital pin 2 positive edge trigger

   while(1)
   {
      if(master_count > 7)
       {
         detachInterrupt(digitalPinToInterrupt(CLOCK));
         // digitalWrite(DATA, LOW);
         readingOffset++;
         if(readingOffset >= 3){
            printBIN(in_buffer);
            readingOffset = 0;
         }
         in_buffer = 0;
         master_count=0;

         //delay(3);
         break;
     }
   }
}


void interrupt() {
       boolean read = digitalRead(DATA);
       noInterrupts();
       if(read==true)bitSet(in_buffer,(7-master_count));
       master_count++;
       interrupts();
}

String digitOne = "";
String digitTwo = "";
bool shouldPrint = false;
int printed = 0;
//function that also prints leading zeros
String temp = "";
void printBIN(volatile uint8_t* binary)
{

  for(int byteIndex = 0; byteIndex < 8; byteIndex++){
      if(numTable[byteIndex] == binary){
        if(!secondByte){
          secondByte = true;
          if(byteIndex > 10){
              //return;
          }

          if(digitTwo != String(byteIndex, DEC)){
            digitTwo = String(byteIndex, DEC);
            shouldPrint = true;
          }
        }else{
          secondByte = false;
          if(digitOne != String(byteIndex, DEC) && digitTwo != String(byteIndex, DEC)){
            digitOne = String(byteIndex, DEC);
            shouldPrint = true;
          }
        }
        if(shouldPrint){
          if(printed == 1){
            if(temp.length() >= 2){
              temp = "";
            }else{
              temp += String(digitOne + digitTwo);
            }
            printed = 0;
          }else{
            if(temp.length() == 2){
              temp = "";
            }else{
              temp += String(digitOne + digitTwo);
            }
            printed++;
          }
          shouldPrint = false;
          if(temp.length() == 2){
              Serial.println(temp);
              temp = "";
          }else{
          }
        }
      }else{

        if(binary == B11111111){
          return;
        }
      }
  }
}