Let's look at the real code for our AI tanks. Let's create a new class, called SimpleFSM, which inherits from our FSM abstract class.

The code in the SimpleFSM.cs file is as follows:

using UnityEngine; 
using System.Collections; 
 
public class SimpleFSM : FSM  
{ 
 
    public enum FSMState 
    { 
      None, 
      Patrol, 
      Chase, 
      Attack, 
      Dead, 
    } 
 
    //Current state that the NPC is reaching 
    public FSMState curState; 
 
    //Speed of the tank 
    private float curSpeed; 
 
    //Tank Rotation Speed 
    private float curRotSpeed; 
 
    //Bullet 
    [SerializeField]
    private GameObject Bullet; 
 
    //Whether the NPC is destroyed or not 
    private bool bDead; 
    private int health; 

    // We overwrite the deprecated built-in `rigidbody` variable.
    new private Rigidbody rigidbody;

Here, we declare a few...