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