$.$ Essentially, you are given a complete list of directories and files in the file system, and then a subset of files. Return an augmented list of the subset, where if all files in a directory are listed in the subset, replace those file names with the directory name.

Example input & output:

allFiles $=[$

$"$a$/$b$/$c$/$d$.$txt$",$

$"$a$/$b$/$c$/$e$.$txt$",$

$"$a$/$b$/$b$.$txt$",$

$"$a$/$b$/$e$.$txt$",$

$"$b$/$c$/$d$.$txt$"$

$"$d$/$ab$/$somefile$.$txt$""$da$/$b$/$somefile$.$txt$"$

$]$

subsetFiles $=[$

$"$a$/$b$/$c$/$d$.$txt$",$

$"$a$/$b$/$c$/$e$.$txt$",$

$"$a$/$b$/$b$.$txt$",$

$"$b$/$c$/$d$.$txt$",$

$"$d$/$ab$/$somefile$.$txt $","$da$/$b$/$somefile$.$txt$"$

$]$

output$=[$

$"$a$/$b$/$c$",$

$"$a$/$b$/$b$.$txt$",$

$"$b$",$

$"$d$/$ab$/"$

$"$da$/$b$/"$

$]$