Perl Card Shuffle - Calling up a library file

I have created a card shuffling script in perl. It shuffles up the deck and prints the top 5 cards. Now I'm being asked to remove the code that does the shuffling and include it as another function of a library file I've already create  "obj13-lib.pl". Here's what should take place. After the first "hand" is dealt, call the shuffling function again before dealing another, different hand.

Here's the code for my card shuffling program.

#!/usr/bin/perl

@startingdeck = ("A H","2 H","3 H","4 H","5 H","6 H","7 H","8 H",
                 "9 H","10 H","J H","Q H","K H",
                 "A D","2 D","3 D","4 D","5 D","6 D","7 D","8 D",
                 "9 D","10 D","J D","Q D","K D",
                 "A C","2 C","3 C","4 C","5 C","6 C","7 C","8 C",
                 "9 C","10 C","J C","Q C","K C",
                 "A S","2 S","3 S","4 S","5 S","6 S","7 S","8 S",
                 "9 S","10 S","J S","Q S","K S");
for my $x(0..99){
     my@shuffle=(
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
);
   push@startingdeck, @shuffle;
}
   print"@startingdeck [0..4]\n";