Update to non pointers and not working gravit

CMakeLists.txt

@@ -21,9 +21,9 @@ find_package(raylib REQUIRED)
 
 add_executable(${PROJECT_NAME}
     main.c
-    cphysics.c
     mechanics.c
-    vec_util.c
+    vec_utils.c
+    gravity.c
 )
 
 target_link_libraries(${PROJECT_NAME}