code: func square(width, height int) float64 {
  	if width == 0 && height == 0 {
  		return 0
  	}
  	if width <= height {
  		return float64(width) / float64(height)
  	}
  	return float64(height) / float64(width)
  }
docs: // square returns a float value indicating how much the given rectangle is close to a square.
  // If the given rectangle is square, this return 1 (maximum value).
  // Otherwise, this returns a value in [0, 1).