517:/lib/trade.c (/lib/trade.c)
(int *) calc_change_str(int *arr, string str)
/*
 * Function name: calc_change_str
 * Description:   Consider what coins the object wants to be payed in
 * Arguments:     arr - the array holding the coins
 *                str - the string describing what types the object wants
 * Returns:       The array depending on what object wants
 */
