Salve ragazzi, questo è un programma che dovrebbe mischiare 52 carte, ma C::B segnala un warning alla riga 19, ma non capisco il problema, potete dare un' ochiata?

codice:
#include<stdio.h>
#include<stdlib.h>
#include<time.h>


void shuffle(int [][13]);
void deal( const int [][13], const char *[], const char *[]);


main()
{
 char *suit[4] = {"Hearts", "Diamonds", "Clubs", "Spades"};
 char *face[13] = {"Ace","Deuce", "Three", "Four", "Five", "Six", "Seven",
                "Eight", "Nine", "Ten", "Jack", "Queen", "King"};
 int deck[4][13] = {0};


 srand(time(NULL));


 shuffle(deck);


 deal(deck, face, suit );


return 0;
}


void shuffle( int wDeck[][13])
{
   int card, row, column;


   for(card=1; card<=52; card++){


   row=rand()%4;
   column=rand()%13;


        while(wDeck [row][column] != 0){


        row = rand()%3;
        column= rand ()%13;}


    wDeck [row][column]=card;}
   }


void deal ( const int wDeck[][13], const char *wFace[], const char *wSuite[])
{
 int card, row, column;


   for(card=1; card<=52; card++)


    for(row=0; row<=3; row++)


   for(column=0; column<=12; column++){


      if(wDeck[row][column] == card)
        printf("%5s of %-8s%c",
                 wFace[column], wSuite[row],
                 card % 2 == 0 ? '\n' : '\t');
   }




}