Hello,

I'm trying to come up with a way to recreate a directory hierarchy. Entries 
within zip archives are just flat strings like "top/level/file1", but I 
would like to operate on them hierarchically. So my problem could be stated 
as:
If 

  (restore-hierarchy [["top" "level" "file1"] ["top" "level" "file2"] ["top" 
"level2" "file3"]]) 

returns 

  {"top" {"level" ("file1" "file2"), "level2" ("file3")}}

 what does a nice definition of #'restore-hierarchy look like? Sadly my own 
attempts to hack it are too embarrassing to post them here...

Thanks,

Steffen

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