Challenge: Physics engine

Tomás works on the physics engine for a game studio. A physics engine simulates events like movement, acceleration, and collision, so game objects can interact with each other.

Tomás's simulation moves a ball to the right for several time steps, but then the ball disappears. What edge case did he miss? The ball is passing through the right wall!

• Add a third parameter to the move() function that represents the position of the right wall.
• Modify the move() function body to stop the ball at the right wall.

The screen starts at position 0, continues for output_width units, and then ends at the right wall. That means the right wall position is equal to output_width.

If the ball tries to move past the right wall, move() should just return the right wall position.