cake_number;first_price 

cake_1;3;
cake_2;4;
cake_3;9;
cake_4;7;
cake_9;8;

##</code><code>##

cake_number;second_price 

cake_1;5;
cake_2;5;
cake_3;5;
cake_6;9;
cake_10;1;

##</code><code>##

cake_number;frist_price;second_price;

cake_1;3;5;
cake_2;4;5;
cake_3;9;5;


##</code><code>##

my %hash_table_1;
open(INFILE_1, "<$infile_1");

while (my $line_1 = <INFILE_1>){
	my @Elements_1 = split ';', $line_1;
	chomp($Elements_1[1]);
	$hash_table_1{$Elements_1[0]} = $Elements_1[1];
}

my %hash_table_2;
open(INFILE_2, "<$infile_2");

while (my $line_2 = <INFILE_2>){
	my @Elements_2 = split ';', $line_2;
	chomp($Elements_2[1]);
	$hash_table_2{$Elements_2[0]} = $Elements_2[1];
}

my @KEYS_1 = keys(%hash_table_1);
my @KEYS_2 = keys(%hash_table_2);

my $key_1;

foreach $key_1(@KEYS_1){
	if ( defined $hash_table_2{$key_1}){
	print OUTFILE "$key_1;$hash_table_1{$key_1};$hash_table_2{$key_1}\n";  	}
}
close OUTFILE;
close INFILE_1;
close INFILE_2;