split_path(path) is a platform independent and file system logic
aware alternative to strsplit(path, '/')[[1]].
merge_path(split_path(path)) is equivalent to path.
split_path(path)merge_path(components)
the path to split
character string vector of path components to merge
split_path returns a character vector of path components that
logically represent path.
merge_path returns a single character string that is
logically equivalent to the path passed to split_path.
logically represent path.