fix: reset game timer on state reset and don't zero timers when stopping them

cudoku.c

@@ -289,6 +289,7 @@ void reset_state(Cudoku *game) {
   game->should_draw_selection = false;
   game->should_highlight_mistakes = false;
   game->has_won = false;
+  timer_reset(&game->timer);
 }
 
 bool check_win(Cudoku *game) {
@@ -564,8 +565,6 @@ void generate_random_board(Cudoku *game) {
   }
 
   remove_numbers(game);
-
-  timer_reset(&game->timer);
 }
 
 void reset_board(Cudoku *game) {

timer.c

@@ -35,7 +35,6 @@ float timer_remaining(Timer *timer) {
 }
 
 void timer_stop(Timer *timer) {
-  timer->time = 0.0f;
   timer->is_running = false;
 }
 

timer.h

@@ -3,6 +3,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <sys/time.h>
+
 extern struct timeval start_time;
 
 typedef struct Timer {
@@ -11,7 +12,6 @@ typedef struct Timer {
   bool is_running;
 } Timer;
 
-
 double get_time();
 void start_internal_timer();
 bool timer_ended(Timer *timer);