Game state is now preserved in a file

game.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <raylib.h>
+#include <stdio.h>
 
 #define BOARD_WIDTH 4
 #define BOARD_HEIGHT 4
@@ -9,10 +10,10 @@ typedef enum { UP, DOWN, LEFT, RIGHT } move_direction_t;
 typedef enum { PLAYING, WON, LOST } game_status_t;
 
 typedef struct {
-  int board[BOARD_HEIGHT][BOARD_WIDTH];
+  unsigned int board[BOARD_HEIGHT][BOARD_WIDTH];
   game_status_t status;
-  int score;
-  int moves_made;
+  unsigned int score;
+  unsigned int moves_made;
 } GameState_t;
 
 void move(GameState_t *state, move_direction_t direction);