$_ is a global.
Beside that to get the first parameter you passed to your subs you should use
my $line = lc $_[0];
# and
$another_line = $_[0];
as it is the first element in the @_ array, which contains all arguments to the sub.
Beside that you should not use $ in sub names, you should not use & in function calls and you should use warnings.
Cheers, Flo
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