Naming multiple variables with the same name like you did ($args, %args) is
a
bad idea.  because when you want to access the value of the hash %args
($args{FN}) you are accessing in reality what was shifted in the scalar
$args and not the hash %args
because perl use simbolic reference.
here is a link that explain that

https://perlmaven.com/symbolic-reference-in-perl
*Khalil Zakaria Zemmoura*
*Visiteur Médical EST*
*Laboratoire NOVOMEDIS*

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