F find_common_directory_path(paths, sep = ‘/’)
   V pos = 0
   L
      L(path) paths
         I pos < path.len & path[pos] == paths[0][pos]
            L.continue

         L pos > 0
            pos--
            I paths[0][pos] == sep
               L.break
         R paths[0][0.<pos]
      pos++

print(find_common_directory_path([
   ‘/home/user1/tmp/coverage/test’,
   ‘/home/user1/tmp/covert/operator’,
   ‘/home/user1/tmp/coven/members’]))