[C++] Łączenia dwóch tablic typu char

char * char1 = "AAA";
char * char2 = "BBB";
string napis1( char1 );
string napis2( char2 );
string napis3 = napis1 + napis2;
char char3[ napis3.size() ];
strcpy( char3, napis3.c_str() );

char * make_one( char * a, char * b ) {
    int aa = strlen( a );
    int bb = strlen( b );
    int cc = a + b;
    char * c = new char[ cc + 1 ];
    c[ cc ] = 0;
    for( int i = 0; i < aa; i++ ) c[ i ] = a[ i ];
   
    for( int i = aa; i < cc; i++ ) c[ i ] = b[ i - aa ];
   
    return c;
}

char charOne[] = "This is...";
char charTwo[] = " example";

std::string strResult = std::string( charOne ) + std::string( charTwo );

char result[ static_cast < int >( strResult.size() ) + 1 ];
for( size_t i = 0; i < strResult.size() + 1; i++ )
     result[ i ] = '\0';

strncat( result, strResult.c_str(), static_cast < int >( strResult.size() ) + 1 );