so, the program is doing everything what is suppose to do but the hardware is not responding to it. It looks like the car get stuck at turning right and don't do anything anymore
So, now you need to create several test sketches. In one, call turnRight(). Make sure the car does what it is supposed to. If it does, change the call to turnLeft(). Again, make sure the car does what it is supposed to. Then, call forward(), haltMotors(), etc. and verify each function independently.