cleanpath(path_name​, working_path)

Clean file path names removing redundant characters as well as circular paths

Removes redundant characters from the file path name, e.g. '//', '/./' as well as initial './' and circular paths e.g. 'abc/def/../def/'.
Additionally, all file separators are set to the platform file separator.

If a working directory path is given (the pwd function can be used to get the current directory), the input path name is assumed to be an absolute path and the working directory path is removed thus returning the relative path.