added comments

main/collision.c

+/*******************************************************************
+    File representing collisions between objects
+    authors: Pelech Ondrej, Pham Thi Thien Trang 
+    date:  May 2023
+ *******************************************************************/
+
 #include <stdint.h>
 
 #include "enemy.h"
@@ -6,6 +12,8 @@
 #include "obstacle.h"
 #include "collision_rect.h"
 
+
+// checks for object collisions of exact types
 void check_collisions(player_t* player, enemy_t** enemies, obstacle_t** obstacles, int num_obstacles, int max_obstacles, projectile_t** projectiles,
                     int num_projectiles, int max_projectiles, int num_enemy) {
     
@@ -14,6 +22,7 @@ void check_collisions(player_t* player, enemy_t** enemies, obstacle_t** obstacle
     check_player_collision_with_obstacles(player, obstacles, num_obstacles, max_obstacles);
 }
 
+// checks for collisions with projectiles
 void check_collision_with_projectiles(player_t* player, enemy_t** enemies, obstacle_t** obstacles, int num_obstacles, int max_obstacles, projectile_t** projectiles,
                     int num_projectiles, int max_projectiles, int num_enemy) {
     for (int i = 0; i < num_projectiles; i++) {
@@ -60,6 +69,7 @@ void check_collision_with_projectiles(player_t* player, enemy_t** enemies, obsta
     sort_projectiles(projectiles, max_projectiles);
 }
 
+// checks for collisions with obstacles
 void check_player_collision_with_obstacles(player_t* player, obstacle_t** obstacles, int num_obstacles, int max_obstacles) {
     for (int i = 0; i < num_obstacles; i++) {
         obstacle_t* obstacle = obstacles[i];