title: Avoid multiple definitions of headers
body: <p>I've spent like 2 days researching to avoid the multiple definition of some arrays and I found <code>#ifdef</code> and bla bla. So I tried to test my program with that <code>#ifdef</code> and it doesn't do anything, the debugger is still saying that there are multiple definitions. My programs works like this. </p>
  
  <p><img src="https://i.stack.imgur.com/b6zXJ.png" alt="enter image description here"></p>
  
  <p>Of course there are multiple definition, but I need to make this like I've shown you in the pic... I think this is a compiler problem or something related about compiler.</p>
  
  <p>PD: I suppose you don't need any code to resolve my problem, if you need then I'll share.</p>
  
  <p>GameObject.h:</p>
  
  <pre><code>#ifndef GameObject_H
  #define GameObject_H
  
  #pragma once
  
  float cube[] =
  {
      -1.0f,-1.0f,-1.0f,
      -1.0f,-1.0f, 1.0f,
      -1.0f, 1.0f, 1.0f,
      1.0f, 1.0f,-1.0f,
      -1.0f,-1.0f,-1.0f,
      -1.0f, 1.0f,-1.0f,
      1.0f,-1.0f, 1.0f,
      -1.0f,-1.0f,-1.0f,
      1.0f,-1.0f,-1.0f,
      1.0f, 1.0f,-1.0f,
      1.0f,-1.0f,-1.0f,
      -1.0f,-1.0f,-1.0f,
      -1.0f,-1.0f,-1.0f,
      -1.0f, 1.0f, 1.0f,
      -1.0f, 1.0f,-1.0f,
      1.0f,-1.0f, 1.0f,
      -1.0f,-1.0f, 1.0f,
      -1.0f,-1.0f,-1.0f,
      -1.0f, 1.0f, 1.0f,
      -1.0f,-1.0f, 1.0f,
      1.0f,-1.0f, 1.0f,
      1.0f, 1.0f, 1.0f,
      1.0f,-1.0f,-1.0f,
      1.0f, 1.0f,-1.0f,
      1.0f,-1.0f,-1.0f,
      1.0f, 1.0f, 1.0f,
      1.0f,-1.0f, 1.0f,
      1.0f, 1.0f, 1.0f,
      1.0f, 1.0f,-1.0f,
      -1.0f, 1.0f,-1.0f,
      1.0f, 1.0f, 1.0f,
      -1.0f, 1.0f,-1.0f,
      -1.0f, 1.0f, 1.0f,
      1.0f, 1.0f, 1.0f,
      -1.0f, 1.0f, 1.0f,
      1.0f,-1.0f, 1.0f
  };
  
  float Space3D_X[] =
  {
      0.0f, 0.0f, -100,
      0.0f, 0.0f, 100
  };
  
  float Space3D_Z[] =
  {
      -100.0f, 0.0f, 0.0f,
      100.0f, 0.0f, 0.0f
  };
  
  float Space3D_Y[] =
  {
      0.0f, -100.0f, 0.0f,
      0.0f, 100.0f, 0.0f
  };
  
  typedef struct GameObject
  {
      int ID, parent;
      Vector3 position;
      Quaternion rotation;
  };
  
  struct GameObject GameObjects[65536];
  
  typedef struct Entity
  {
      static int GameObjectsCount;
      int CreateCube (Vector3 _position, Quaternion _rotation, int _parent);
      void SetGameObjectParent (int _gameObject, int _parent);
  };
  
  Entity Entity_t;
  
  #endif // GAMEOBJECT_H
  </code></pre>