This is a helper function to check ver_walls and hor_walls. It's called by
check_user_world twice.
Uso
check_walls(dataset, name, nx, ny, lang)
Argumentos
- dataset
Either hor_walls or ver_walls
- name
Character string: "hor_walls" or "ver_walls"
- nx,
ny Size of the world
- lang
language code (such as "en" or "es") for printing messages
Valor
If a misespecification is found, this function produces a stop and
provides a descriptive error message.
