c++ – How to compile and link correctly using visual studio command line?

I am following Microsoft’s instructions to create OBJ files and then link them into an EXE.

https://learn.microsoft.com/en-us/cpp/build/reference/c-compile-without-linking?view=msvc-170

I compile The OBJ files like this:

CL /EHsc /c /std:c++20 SharedDependency.cpp Dependence1.cpp Dependence2.cpp Main.cpp 

And I link them like this:

LINK  SharedDependency.obj Dependence1.obj Dependence2.obj Main.obj /OUT:Main.exe

And the result is this: (Note: This error message is summarized)

Dependence1.obj : error LNK2005:  it has already been defined --> SharedDependency::SomeFuction()
Dependence2.obj : error LNK2005:  it has already been defined --> SharedDependency::SomeFuction()
Main.obj : error LNK2005:  it has already been defined --> SharedDependency::SomeFuction()

fatal error LNK1169: One or more simultaneously defined symbols were found

---

ABOUT DEPENDENCIES

---

In SharedDependency.h

#pragma once
class SharedDependency
{
 void SomeFuction();
};

In SharedDependency.cpp

 #include "SharedDependency.h"
 void SharedDependency::SomeFuction(){}

In Dependence1.h

#pragma once    
class Dependence1
{        
    void SomeFuction(class SharedDependency SD);
};

In Dependence1.cpp

#include "SharedDependency.h"
#include "Dependence1.h"
void Dependence1::SomeFuction(SharedDependency SD){}

In Dependence2.h

#pragma once   
class Dependence2
{ 
    void SomeFuction(class SharedDependency SD);
};

In Dependence2.cpp

#include "SharedDependency.h"
#include "Dependence2.h"
void Dependence2::SomeFuction(SharedDependency SD){}

In the Main.cpp

   #include "Dependence1.h"
   #include "Dependence2.h"

   class Main
   {
      Dependence1 D1;
      Dependence1 D2;
   }; 
    
    
   int main(int argc, wchar_t **argv)
   {
     Main m;
     return 0;
   }

What is the correct way to compile this?