I think your problem is that you do too much at once without testing the result from the intermediate steps.
Most of my scripts start with
# always use those:
use strict;
use warnings;
use Data::Dumper;
When you suspect that split isn't working the way you think it is, try adding the line
print Dumper \@foo; immediately after the split, and look if the results are what you execpted it to be.
The $foo[$_] is always empty so
for iterates over the values in the array, not the indexes. So instead of $foo[$_] just write $_.
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