having trouble writing these programs (IN C)

int draw_card(int[]);

/* Picks the first card that hasnt been drawn already, marks it as taken and returns the value of the card.

Change value to -1 at the location to indicate taken

Arguments int[] deck of cards, which was created in main()

return int: value of card drawn.

int lucky_seven(int);

/*

Implements lucky seven game logic. Takes in one card value and checks if it is equal to 7.

return 1 if value matches indicating the user won, return 0 if user loses.