void moveNumbers(){
  if(Serial.available() > 0){
    String myk = Serial.readString();
    Serial.print(myk);
    checkIfCorrectCommand(myk);
  }
  for(int i=0; i<3; i++){
    copyRowOfMatrix(i, i+1, toDisplay, toDisplay);
  }
  copyRowOfMatrix(3, currentWorkingIndex++, toDisplay, currentNumbersToDisplay);
  if(currentWorkingIndex == 6){
    currentWorkingIndex = 0;
  }
  displayArray();
  //delay(timeDelay);
}