.h

#ifndef MY_LIB_H
#define MY_LIB_H

#define BOARD_SIZE 9

typedef struct Sudoku                           ///
{                                               ///     Defined data type StackData to store Sudoku boards
    short int data[BOARD_SIZE][BOARD_SIZE];     ///
} Sudoku;                                       ///
                                                ///
typedef Sudoku StackData;                       ///

struct Node{
    struct Node *next;
    StackData value;    ///changed int to StackData
}; typedef struct Node Node;

Node * GNN(StackData number);   ///changed int to StackData
void push (StackData number, Node **head); ///changed int to StackData
void pop (Node ** head);
void print_stack(Node *head);
void destroy_stack(Node **head);
double average(Node *head, double size);
//if array is empty, returns 0
//if array does not have positive numbers returns 0
//otherwise returns average of positive numbers
int read_num();
void create_stack (Node **head);
#endif