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Using a namespace to create global functions, but getting multiple specific characters

These functions are objects of type Utility that will be used by most objects of my programs. I want to have them in the namespace and have them global. This namespace is defined in the header and then added to my precompiled header. However, so far I have used a function from this namespace in two different objects, and the compiler throws an error with multiple specific characters on these 2 objects.

namespace file

#ifndef UTILS_H
#define UTILS_H

#include <random>
#include <cmath>


namespace Utils
{
    extern int GetRandomBetween(int low, int high)
    {
        if (low < 0 || low >= high)
            return 0;
        int seed = high - low;

        return (rand() % seed) + low;
    }
};

#endif

and precomp header

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//

#pragma once

#include "targetver.h"

//#define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers
// Windows Header Files:
#include <windows.h>

// C RunTime Header Files
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <random>


#define SAFE_DELETE( p )       { if( p ) { delete ( p );     ( p ) = NULL; } }
#define SAFE_DELETE_ARRAY( p ) { if( p ) { delete[] ( p );   ( p ) = NULL; } }
#define SAFE_RELEASE( p )      { if( p ) { ( p )->Release(); ( p ) = NULL; } }
// TODO: reference additional headers your program requires here

#include "Utils.h"
#include "Manager.h" // this object uses utils
#include "Bot.h"    // this object uses utils
#include "LinkedList.h"
#include "Village.h"  // this object will use utils in the future

Linker Error Message:

Manager.obj : error LNK2005: "int __cdecl Utils::GetRandomBetween(int,int)" (?GetRandomBetween@Utils@@YAHHH@Z) already defined in Bot.obj stdafx.obj : error LNK2005: "int __cdecl Utils::GetRandomBetween(int,int)" (?GetRandomBetween@Utils@@YAHHH@Z) already defined in Bot.obj c:\users\lee\documents\visual studio 2010\Projects\AI\Debug\AI.exe : fatal error LNK1169: one or more multiply defined symbols found

It may also be worth noting that in the header of my manager I forward the advertised bot. Same thing with the Village class header.

+5
2

( : ) . , , , extern ( ) (.. ). :

util.h:

namespace Utils
{
    int GetRandomBetween(int low, int high);
};

SomeSourceFile.cpp(, Util.cpp):

namespace Utils
{
    int GetRandomBetween(int low, int high);
    {
        if (low < 0 || low >= high)
            return 0;
        int seed = high - low;

        return (rand() % seed) + low;
    }
};

inline :

namespace Utils
{
    inline int GetRandomBetween(int low, int high)
    {
        if (low < 0 || low >= high)
            return 0;
        int seed = high - low;

        return (rand() % seed) + low;
    }
};

.

+10

Manager.cpp Bot.cpp Util.h

- , , "GetRandomBetween". , 2 . , ( , ).

, ( ), extern.

+2

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