Implement tree: prints a tree structure of a given directory.
All filenames are printed and subdirectories are properly indented.
$ tree.pl . .
subdir_1
file_1_in_subdir_1
file_2_in_subdir_1
subdir_2
subdir_2_1
file_1_in_subdir_2_1
file_1_in_subdir_2
Implement the previous one using File::Find
Implement the previous one using File::Find::Rule
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