SQLite Query statement - Objective C

My problem is that i cant get the values from the select query as it executes 101 error.

I think that my problem is that it has to be with the quotes in select statement

sqlite3 * database ;

NSString * path = [[[ NSBundle mainBundle ]resourcePath ] stringByAppendingPathComponent : @"cars.sqlite"];
int returnCode = sqlite3_open ([ path cStringUsingEncoding : NSUTF8StringEncoding], &database) ;

sqlite3_stmt * statement ;
char * st ;
NSString *querySQL = [NSString stringWithFormat: @"select brand,model from cars where brand=%@;", tmpbrand];

const char *query_stmt = [querySQL UTF8String];
st = sqlite3_mprintf (query_stmt);

if(sqlite3_prepare_v2 ( database , query_stmt , -1 ,& statement ,NULL )==SQLITE_OK){
returnCode = sqlite3_step ( statement ) ; // this statement returns a record

while ( returnCode == SQLITE_ROW ) // while there are rows
{
    models*tmp=[[models alloc]init];

    char* n=(char*)sqlite3_column_text(statement,0);
    tmp=[NSString stringWithCString:n encoding:NSUTF8StringEncoding];
    char* model=(char*)sqlite3_column_text(statement, 1);
    tmp.model=[NSString stringWithCString:model encoding:NSUTF8StringEncoding];


    [data addObject:tmp];

    returnCode = sqlite3_step ( statement ) ; // this statement returns a record

}
    sqlite3_finalize(statement);
}

}