TTP23 Touchpad Switch

const int switchPin = 3;
const int ledPin = 2;

int state;
int lastState;
int ledState;

void setup() {
  pinMode(ledPin,OUTPUT);
  pinMode(switchPin,INPUT_PULLUP);
}
void loop(){
state = digitalRead(switchPin);
if (state != lastState){
  if (state==HIGH){
    if (ledState==HIGH) ledState= LOW;
    else ledState = HIGH;
  }
  lastState=state;
}
digitalWrite(ledPin,ledState);
delay(20);
}