Design a program using pseudocode that models the worm's behavior in the following scenario:
A worm is moving toward an apple. Each time it moves, the worm cuts the distance between itself and the apple by its own body length until the worm is close enough to enter the apple. The worm can enter the apple when it is within a body length of the apple.
This solution provides guidelines on designing a program using pseudocode to depict a worm's movement.