Resolve UART Namespaces

#include <iostream>
using namespace std;

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

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


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

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


    return 0;
}

Solving Approach