void DoSwingAction()
 {
     if (Input.GetKey(KeyCode.W))
     {
         pendulum.bob.velocity += pendulum.bob.velocity.normalized * 2;
     }
     if (Input.GetKey(KeyCode.A))
     {
         pendulum.bob.velocity += -cam.transform.right * 1.2f;
     }
     if (Input.GetKey(KeyCode.D))
     {
         pendulum.bob.velocity += cam.transform.right * 1.2f;
     }
     transform.localPosition = pendulum.MoveBob(transform.localPosition, previousPosition, Time.deltaTime);
     previousPosition        = transform.localPosition;
 }
 // Update is called once per frame
 void Update()
 {
     transform.localPosition = pendulum.MoveBob(transform.localPosition, Time.deltaTime);
 }