simulation: separate out mutation into its own function

src/simulation.c

@@ -23,9 +23,8 @@ static const Color possible_colors[] = {
     ['\0'] = {0x0, 0x0, 0x0, 0xff},
 };
 
-void simulation_iterate(simulation_t *sim)
+void simulation_mutate(simulation_t *sim)
 {
-// Mutate cells if an option
 #if MUTATION_CHANCE
   for (u64 i = 0; i < SIMULATION_SIZE; ++i)
   {
@@ -35,7 +34,10 @@ void simulation_iterate(simulation_t *sim)
     }
   }
 #endif
+}
 
+void simulation_iterate(simulation_t *sim)
+{
   u64 a = 0, b = 0;
   while (a == b)
   {

src/simulation.h

@@ -16,6 +16,7 @@ typedef struct
   bf_token memory[SIMULATION_SIZE];
 } simulation_t;
 
+void simulation_mutate(simulation_t *sim);
 void simulation_iterate(simulation_t *sim);
 void simulation_draw(simulation_t *sim);