In this task, the job is to create a new empty file called "output.txt" of size 0 bytes
and an empty directory called "docs". This should be done twice: once "here", i.e. in the current working directory and once in the filesystem root.

use File::Spec::Functions qw(catfile rootdir);
{ # here
    open my $fh, '>', 'output.txt';
    mkdir 'docs';
};
{ # root dir
    open my $fh, '>', catfile rootdir, 'output.txt';
    mkdir catfile rootdir, 'docs';
};