rather not use modules, sorry. i want to be able to write it myself.
Sure, it's a nice learning experience to write something yourself. Two comments:
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format isn't a module. It comes with the perl core.
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It's usually a waste of time and resources to solve a problem that has already been solved. If a module is readily available on CPAN, it's usually a good idea to use it, because chances are that it has been community-tested (no guarantees, though) and it's difficult to come up with a better solution if you start from scratch.
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