You need to export the DNAappend symbol. I would use DNAlibrary or some such name, presuming that you will add other DNA routines to this thing.
#!/usr/bin/perl -w
use strict;
use DNAlibrary;
my $a='ATGC';
my $b='TTTT';
print"\n\n";
print DNAappend($a,$b), "\n\n"; #ATGCTTTT
#!/usr/bin/perl -w
use strict;
package DNAlibrary; #FILE name should be DNAlibrary.pm
use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION);
use Exporter;
our $VERSION=1.0;
our @ISA = qw(Exporter);
our @EXPORT = qw(DNAappend);#these are the default exports
our @EXPORT_OK = qw(); #these are export on request
sub DNAappend {
my ($head,$tail)=@_;
return ($head.$tail)
}
1;
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