fix: massive memory leak (not all fixed) and added more test cases

include/particle.h

@@ -6,6 +6,7 @@
 #include <stdatomic.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <stdio.h>
 
 #define G_CONSTANT 1.98f
 
@@ -148,7 +149,7 @@ void collision_update(Particle *particles, unsigned long long count, float resti
 
 void *t_update(void *args) {
 	Physics_params *params = (Physics_params *)args;
-	while (params->exit != 1) {
+	while (!params->exit) {
 		pthread_mutex_lock(params->mutex);
 		while (params->run == 0) {
 			pthread_cond_wait(params->cond, params->mutex); // sleeps here
@@ -202,6 +203,7 @@ void *t_update(void *args) {
 		pthread_barrier_wait(params->barrier);
 	}
 
+    printf("INFO: Thread %llu exiting\n", params->thread_id);
 	return NULL;
 }