public void SetState(LittleBossState state)
 {
     if (_state != null)
     {
         _state.Exit(this);
     }
     _state = state;
     _state.Enter(this);
 }
 private void Start()
 {
     _rb    = GetComponent <Rigidbody>();
     _state = LittleBossIdleState.GetInstance();
 }