RFID RDM6300

#include <SoftwareSerial.h>

String card_00 = "0000000000";

String card_01 = "0A00704893";

char card_02[] = "0A00704854"; 

char card_03[] = "0B002B076B"; 

char card_04[] = "0A00734AEA"; 

char card_05[] = "0A007334CB"; 

char card_06[] = "0B002835D4"; 

char card_07[] = "0B002805C3"; 

char card_08[] = "0B002442E0"; 

char card_09[] = "0A006516EC"; 

char card_10[] = "0B002F218A"; 

char card_11[] = "0B002F24BD"; 

char card_12[] = "0B00231F1B"; 

char card_13[] = "0B002FF1EC"; 

char card_14[] = "0A0077518F";

char card_15[] = "0B00346D39";

char chip[11];

int i = 0;

int cardnumber = 0;

const int rxPin = 3;

const int txPin = -1;

const int rfidBaud = 9600;

SoftwareSerial rfid(rxPin, txPin);

const int startZeichen = 02;

const int kennungLaenge   = 10;

int bytesGelesen = 0;

void setup()

{

  Serial.begin(9600);

  rfid.begin(rfidBaud);

}

void loop()

{

  if (rfid.available() >=  kennungLaenge)

  {

    if(rfid.read() == startZeichen)

    {

      bytesGelesen = 0;

      while(bytesGelesen < kennungLaenge)

      {

        char zeichen = rfid.read();

        chip[bytesGelesen] = zeichen;

        bytesGelesen ++;

      } 

      chip[bytesGelesen] = 0;

      card_01 = chip;

      Serial.println(chip);

  //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!   

 if (chip == card_01) //line64

     {

      Serial.println("test"); 

     }

    }

  }

}