separated the headers and c files properly

vec_util.h

@@ -1,43 +1,21 @@
+#pragma once
 #ifndef VEC_UTIL_H_
 #define VEC_UTIL_H_
 #include <math.h>
 #include <raylib.h>
 static const Vector2 NULL_VEC2 = {0, 0};
 
-Vector2 transform_to_center(Vector2 v) {
-  int width = GetRenderWidth();
-  int height = GetRenderHeight();
-  Vector2 result = {v.x + width / 2.0, v.y + height / 2.0};
-  return result;
-}
+bool vec2_is_null(Vector2 v) ;
 
-Vector2 vec2_sum(const Vector2 *a, const Vector2 *b) {
-  Vector2 result = {a->x + b->x, a->y + b->y};
-  return result;
-}
-Vector2 vec2_diff(const Vector2 *a, const Vector2 *b) {
-  Vector2 result = {a->x - b->x, a->y - b->y};
-  return result;
-}
+Vector2 transform_to_center(Vector2 v);
+Vector2 vec2_sum(const Vector2 *a, const Vector2 *b);
+float vec2_len(Vector2 v) ;
 
-float vec2_len(Vector2 v) { return sqrtf(v.x * v.x + v.y * v.y); }
+Vector2 vec2_normalize(const Vector2 v) ;
 
-Vector2 vec2_normalize(const Vector2 v) {
-  float len = vec2_len(v);
-  if (len == 0) {
-    return NULL_VEC2;
-  }
-  Vector2 result = {v.x / len, v.y / len};
-  return result;
-}
+Vector2 vec2_scale(const Vector2 *normal, const float len) ;
 
-Vector2 vec2_scale(const Vector2 *normal, const float len) {
-  Vector2 result = {len * normal->x, len * normal->y};
-  return result;
-}
-
-float vec2_dot(const Vector2 *a, const Vector2 *b) {
-  return a->x * b->x + a->y * b->y;
-}
+float vec2_dot(const Vector2 *a, const Vector2 *b) ;
+Vector2 vec2_diff(const Vector2 *a, const Vector2 *b) ;
 
 #endif // VEC_UTIL_H_