Drawing a gizmo yellow rectangle to visually show a bounding rectangle

As developers, it is useful to see elements such as bounding rectangles when run-testing our game. Let's make the rectangular bounds of the movement visually explicit in yellow lines in the Scene window by drawing a yellow "gizmo" rectangle. Add the following method to the C# script class called PlayerMove:

    void OnDrawGizmos(){
       Vector3 top_right = Vector3.zero;
       Vector3 bottom_right = Vector3.zero;
       Vector3 bottom_left = Vector3.zero;
       Vector3 top_left = Vector3.zero;

       if(corner_max && corner_min){
         top_right = corner_max.position;
         bottom_left = corner_min.position;

         bottom_right = top_right;
         bottom_right.y = bottom_left.y;

         top_left = top_right;
         top_left.x = bottom_left.x;
       }

       //Set the following gizmo colors to YELLOW
       Gizmos.color = Color.yellow;

       //Draw 4 lines making a rectangle
       Gizmos...