added timers to auto-hide help and for counting the time it took to solve the puzzle

cudoku.h

@@ -2,7 +2,9 @@
 
 #include <stdbool.h>
 
+#include "helper.h"
 #include "shader.h"
+#include "timer.h"
 
 typedef struct Vec2 {
   int x;
@@ -22,6 +24,9 @@ typedef struct Cudoku {
   bool should_draw_selection;
   bool should_highlight_mistakes;
   bool should_draw_help;
+  Timer help_timer;
+  Timer timer;
+  float win_time;
 } Cudoku;
 
 typedef struct Color {
@@ -37,7 +42,7 @@ void draw_bg_grid_shader(Shader shader, unsigned int vao, float* transform, floa
 void draw_bg_grid_texture(Shader shader, unsigned int vao, unsigned int texture, float* transform);
 void draw_numbers(Shader shader, unsigned int vao, unsigned int vbo, float *transform, Cell board[9][9]);
 unsigned int prepare_win_overlay();
-void draw_win_overlay(Shader win_shader, Shader font_shader, unsigned int vao, unsigned int font_vao, unsigned int font_vbo, float *transform);
+void draw_win_overlay(Shader win_shader, Shader font_shader, unsigned int vao, unsigned int font_vao, unsigned int font_vbo, float *transform, Cudoku *game);
 void prepare_selection_box(unsigned int *vao, unsigned int *vbo);
 void draw_selection_box(Shader shader, unsigned int vao, unsigned int vbo, int x, int y, float *transform, Color color);
 void highlight_mistakes(Shader shader, unsigned int vao, unsigned vbo, float *transform, Cudoku *game);
@@ -48,5 +53,16 @@ void move_selection(Cudoku *game, int x, int y);
 void toggle_selection(Cudoku *game);
 void generate_random_board(Cudoku *game);
 void reset_board(Cudoku *game);
-void toggle_help(Cudoku *game);
-void draw_help_overlay();
+bool toggle_help(Cudoku *game);
+void draw_help_overlay(
+    Shader overlay_shader,
+    Shader font_shader,
+    unsigned int overlay_vao,
+    unsigned int overlay_vbo,
+    unsigned int font_vao,
+    unsigned int font_vbo,
+    Matrix4x4 *projection,
+    int window_height,
+    Timer *timer
+);
+void draw_timer(Shader shader, unsigned int vao, unsigned int vbo, float *projection, Timer *timer, int win_width);