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my @value;

...
        $cell ? $cell->value() : '';
    } @required_col;
}

##to get the headers of the excel file;
my @value = map {
    my $cell = $worksheet->get_cell(0, $_);
    $cell ? $cell->value() : '';
} @required_col;

sub changeformat {
    my ($header,$data) = @_;
    my @header = @$header;
    my @data = @$data;