[C++] Łączenie char

class CNapis
{
public:
    //...
    char * napis;
   
    CNapis(.., char * napiss )
    {
        napis = napiss;
    }
};

vector < CNapis > napis;


//wyswietlanie:
al_draw_text( fontStelBig, al_map_rgb( 255, 255, 255 ), napis[ i ].x, napis[ i ].y, ALLEGRO_ALIGN_LEFT, napis[ i ].napis );


//...
char levelUp[ 50 ];
char buf[ 10 ];
itoa( hero.level, buf, 10 );

strcat( levelUp, "Nastepny poziom (" );
strcat( levelUp, buf );
strcat( levelUp, ")" );

napis.push_back( CNapis(.., levelUp ) );

char levelUp[ 50 ];
sprintf( levelUp, "%s%s%s", "Nastepny poziom (", buf, ")" );
//albo lepiej
sprintf( levelUp, "Nastepny poziom(%s)", buf );