Function aoc::year2021::day23::deadlock_right

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fn deadlock_right(burrow: &Burrow) -> bool
Expand description

Mirror image situation to deadlock_left where a D amphipod could block others.

For example:

    #############
    #.......D...#
    ###.#.#.#A###
      #.#.#.#B#
      #.#.#.#C#
      #.#.#.#D#
      #########

The hallway has room for the top two amphipods but the D prevents the bottom two from returning to their home burrow.