code:

protected IEnumerator SmoothMovement(Vector3 end)
    {
      Debug.Log($"Variable moveTime value: {moveTime}");
      Debug.Log($"Variable inverseMoveTime value: {inverseMoveTime}");
      Debug.Log($"Variable end value: {end}");
      Debug.Log($"Initial transform.position value: {transform.position}");
      float sqrRemainingDistance = (transform.position - end).sqrMagnitude;
      // TODO remove count logic because this doesn't need to give up if it actually works
      int stepMax = 4;
      int stepCount = 0;
      // while (sqrRemainingDistance > float.Epsilon && stepCount <stepMax)
      // {
      //   Debug.Log($"Distance remaining (squared) = {sqrRemainingDistance}");
      //   Vector3 newPosition = Vector3.MoveTowards(rb2D.position, end, inverseMoveTime * Time.deltaTime);
      //   Debug.Log($"Variable newPosition value: {newPosition}");
      //   rb2D.MovePosition(newPosition);
      //   Debug.Log($"Variable rb2D.position value: {rb2D.position}");
      //   sqrRemainingDistance = (transform.position - end).sqrMagnitude;
      //   stepCount++;
      //   yield return null;
      // }
      while(sqrRemainingDistance > float.Epsilon)
       {
           Debug.Log($"Distance remaining (squared) = {sqrRemainingDistance}");
           //Find a new position proportionally closer to the end, based on the moveTime

           Vector3 newPostion = Vector3.MoveTowards(rb2D.position, end, inverseMoveTime * Time.deltaTime);
           Debug.Log($"Variable newPosition value: {newPostion}");

           //Call MovePosition on attached Rigidbody2D and move it to the calculated position.
           rb2D.MovePosition (newPostion);
           Debug.Log($"Variable rb2D.position value: {rb2D.position}");

           //Recalculate the remaining distance after moving.
           sqrRemainingDistance = (transform.position - end).sqrMagnitude;

           //Return and loop until sqrRemainingDistance is close enough to zero to end the function
           yield return null;
       }
      if (stepCount == stepMax)
        Debug.Log("Gave up on smooth movement");
    }