Well, you don't say what the problem is, but fortunately, I have the ultra-powerful ESP::MindRead module at hand. You're checking whether $oldfile exists, but what you really want is to check that the target file doesn't exist. That is, the one contained in $_ at this point:
my $oldfile = $_;
s/ /_/g;
In other words, test
if (! -e $_)
If that's not the problem, could you please state what it is? ;-)
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