Resolve UART Namespaces

#include <iostream>
using namespace std;

// Create namespace Boot with nested namespace UART
// Create namespace App  with nested namespace UART
namespace Boot{
    namespace UART{
        void send(){
        cout<<"BOOT UART"<<endl;
        }
    }
}
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();
    else 
        cout<<"wrong input"<<endl;
    return 0;
}

Solving Approach