create_filesystem
creates the given folders if they don't already exist.
Examples
internal_folder = file.path(tempdir(), "internal")
public_folder = file.path(tempdir(), "public")
settings_folder = file.path(tempdir(), "settings")
create_filesystem(
internal = internal_folder,
public = public_folder,
settings = settings_folder
)
unlink(c(internal_folder, public_folder, settings_folder), recursive = TRUE)