2 LEDs and 5 Cases

/*
 * this is the blink program
 * Author: Mason
 * 9/1/17
 * Version 3
 */
const int LedPinRed = 11;
 const int LedPinGreen = 10;
 const int Button = 2;
 boolean ReadValue;
 boolean LastValue;
 int counter = 0;

 void setup()
 {

  pinMode (LedPinRed, OUTPUT);
  pinMode (LedPinGreen, OUTPUT);
  pinMode (Button, INPUT);
  Serial.begin (9600);

}
boolean debounce(boolean last)
{
  boolean current = digitalRead(Button);
  if (last != current)
  {
    delay(5);
    current = digitalRead(Button);
  }
  return current;
}

void loop()
{

 if (LastValue == LOW && ReadValue == HIGH);
  ReadValue = debounce (LastValue);
 {
  counter++;
  Serial.println (counter);
 }

  if (counter == 1 || counter == 4)
  {
    digitalWrite (LedPinRed, HIGH);
    digitalWrite (LedPinGreen, LOW);
  }

  if (counter == 2)
  {
    digitalWrite (LedPinRed, LOW);
    digitalWrite (LedPinGreen, HIGH);
  }
 if (counter == 3)
  {
    digitalWrite (LedPinRed, HIGH);
    digitalWrite (LedPinGreen, HIGH);
  }
 if (counter == 5)
  {
    digitalWrite (LedPinRed, LOW);
    digitalWrite (LedPinGreen, LOW);
    counter == 0;
  }

  LastValue = ReadValue;
}