// forum: https://forum.arduino.cc/t/moving-numbers-through-an-array/1106764/
// This Wokwi project: https://wokwi.com/projects/360215012852359169

const int buttonPins[8]={ A0,A1,A2,A3,A4,A5,2,3};
int myArray[8] = {0,3,3,3,0,3,3,3};

int oldStates[8];

void setup() 
{
  Serial.begin(115200);

  for( auto a:buttonPins)
    pinMode(a, INPUT_PULLUP);

  for( auto a:oldStates)
    a = HIGH;

  printNumbers();
}

void loop() 
{
  for( int i=0; i<8; i++)
  {
    int newState = digitalRead( buttonPins[i]);
    if( newState != oldStates[i])  // something changed ?
    {
      if( newState == LOW)   // button pressed ?
      {
        scatter( i);
        printNumbers();
      }
      oldStates[i] = newState; // remember the new state
    }
  }

  delay(20);       // for debouncing of the buttons
}

// To be filled in, something with modulo or if-statement
void scatter( int index)
{
  int t = myArray[index];     // temporary value, the original number.
  myArray[index] = 0;         // empty this one first before distributing them
  for(int i=0; i<t; i++)
    myArray[(index+i+1)%8]++; // modulo 8, to wrap around 0...7
}

void printNumbers()
{
  for( auto a:myArray)
  {
    Serial.print(a);
    Serial.print( " ");
  }
  Serial.println();
}