input: Write a function to move a point from start to end based on a dampening factor.
  assert trajectory_algorithm([0, 0], [10, 10]) == [10, 10]
  assert trajectory_algorithm([1, 1], [4, 5]) == [4, 5]
  assert trajectory_algorithm([2, 3], [5, 8]) == [5, 8]
output: def trajectory_algorithm(start, end, dampening=1.0):
      new_x = start[0] + (end[0] - start[0]) * dampening
      new_y = start[1] + (end[1] - start[1]) * dampening
      return [new_x, new_y]