Reversing digital read. Using SML

Hello, I'm very new to programming and have been doing a project with arduino for a while, it's a timer game which involves 4 leds and 5 buttons. Kinda like whack a mole. Anyway I finished the coding with the help of another guy and the wiring designed by myself only to find that the coding/wiring is reversed ex. I have to hold all 5 buttons for the coding to declare all buttons are off before the game starts. I'm having a hard time fixing this, a guy told me to put a !(not) before every digital read but I don't understand how to do it as I get errors when doing it. If anyway who can help me fix or reverse the coding or wiring I would be greatly appreciated!
I'v put the fritzing jpg as an attachment.

#include <SM.h>
SM game(gameStart);
const int noControls = 4;
const byte led[noControls] = {9, 10, 11, 12};
const byte btn[noControls] = {2, 3, 5, 7};//pin 0 and 1 are for serial
const byte startBtn = 6;
const unsigned long limit = 120;//reaction time limit
byte currentCtrl;
enum btnState {noPress, correct, fault};

void setup(){
  Serial.begin(115200); 
  for(byte i = 0; i<noControls; i++) pinMode(led[i], OUTPUT);
  randomSeed(analogRead(0));
}//setup()

void loop(){
  EXEC(game);
}//loop()

State gameStart(){
  if (not)(digitalRead(startBtn)){
    currentCtrl = random(noControls);//determine control number
    ledCtrl(1<<currentCtrl);//light correct led
    Serial.print("Started with:");
    Serial.println(currentCtrl);
    game.Set(randomLed);//change state
  }//if(stertBtn)
  for(byte i = 0; i<noControls; i++) if(digitalRead(btn[i])){//check if user cheats
    ledCtrl(15);//all leds on
    Serial.println("Cheat!");
    game.Set(miss);//change state
    break;//no need to check further
  }//if(cheat)
}//gameStart()

State randomLed(){
//  if(game.Timeout(limit)){//check for Timeout
//    ledCtrl(15);//all leds on
//    Serial.println("Timeout");
//    game.Set(miss);//change state
//  }//if(Timeout)
  btnState pressed = noPress;
  for(byte i = 0; i<noControls; i++){//scan all buttons
    if(digitalRead(btn[i])){//check individual button
      if(i == currentCtrl){//check validity of btn
        pressed = correct;//we have a hit
      }else{//incorrect btn
        pressed = fault;//false press
        break;//abort scan
      }//()
    }//if(btn[i])
  }//for(i)
  switch(pressed){//act on press
    case correct:
      currentCtrl = 1;//reuse currentCtrl for display
      ledCtrl(currentCtrl);
      Serial.println("Hit");
      game.Set(success);//change state
      break;//case correct
    case fault:
      ledCtrl(15);//all leds on
      Serial.println("Wrong button");
      game.Set(miss);//change state
      break;//case fault
  }//switch(pressed)
}//randomLed()

State miss(){
  if(game.Timeout(1000)){
    ledCtrl(0);//all leds off
    Serial.println("Back to start from miss");
    game.Set(gameStart);
  }//()
}//miss()

State success(){
  if(game.Timeout(300)){//wait 300ms
    currentCtrl <<= 1;//shift 1 bit
      if(currentCtrl<(1<<noControls)){//more ledsd to show?
        ledCtrl(currentCtrl);
        game.Set(success);
      }else{//back to start
        ledCtrl(0);//all leds off
        Serial.println("back to start from success");
        game.Set(gameStart);//change state
      }
  }//if(wait 300 ms)()
}//success()

inline void ledCtrl(byte ctrl){
  for(byte i = 0; i<noControls; i++) digitalWrite(led[i], !!(ctrl&(1<<i)));
}//ledCtrl()