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use Config::Std;
use Readonly;
...
    level => ($config{'log'}{'level'} || $DEFAULT_LOG_LEVEL), 
    file  => ($config{'log'}{'file' } || $DEFAULT_LOG_FILE )
};

my $EMPTY_STRING        ;
my $DEFAULT_LOG_LEVEL   ;
...
    level => ($config{'log'}{'level'} || $DEFAULT_LOG_LEVEL), 
    file  => ($config{'log'}{'file' } || $DEFAULT_LOG_FILE )
};