Resolve UART Namespaces

#include <iostream>
using namespace std;

// Create namespace Boot with nested namespace UART
namespace Boot{
    namespace UART{
        void send(){cout<<"BOOT UART";}
    }
}
// Create namespace App  with nested namespace UART
namespace App{
    namespace UART{
        void send(){cout<<"APP UART";}
    }
}

int main() {
    int mode;
    cin >> mode;

    // Call correct send() function here
    if(mode == 1)Boot::UART::send();
    if(mode == 2)App::UART::send();

    return 0;
}

Solving Approach