Using Boolean and Debounce

/*
 * Jung Min Yean
 * 03/27/19
 * Program about turning on and off one LED with a button
 *
  */


 // Declare Constants and variables
const byte Button=9;
const byte LedPin=17;
const byte LedPin2 = 19;
int count=0;
boolean currentVal;
boolean lastVal; //currentVal and lastVal treats the button as a switch. It evaluates the value of the current and previous press. If different, then in is a new press.

void setup() {
  pinMode(LedPin, OUTPUT); //pinMode assign mode of the pin (input or output)
  pinMode(LedPin2, OUTPUT);
  pinMode(Button, INPUT);
  Serial.begin(9600); //activate the monitor
}
boolean debounce(boolean last)
{
  boolean current = digitalRead(Button);
  if (last != current)
  {
    delay(5);
    current = digitalRead(Button);
  }
  return current;
}
void loop()
{
currentVal = debounce(lastVal);      // will go and read the Button
if (lastVal == LOW && currentVal == HIGH)    // Checks if the button has been pressed
 {
  count++;
 }
  if (count == 1)
  {
    digitalWrite(LedPin, HIGH);
    digitalWrite(LedPin2, LOW);
  }
  else if(count == 2)
  {
    digitalWrite(LedPin2, HIGH);
    digitalWrite(LedPin, LOW);
  }
  else if(count == 3)
  {
    digitalWrite(LedPin, HIGH);
    digitalWrite(LedPin2, HIGH);
  }
  else if (count ==4)
  {
    digitalWrite(LedPin, LOW);
    digitalWrite(LedPin2, LOW);
    count = 0;
  }
  lastVal=currentVal;
}