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Prepare For Segue method not working :(

Hello, I am new to Objective C.

I have a UITableView with a list of links the user has added. When the user clicks on a cell in the table view it will take them to a second view controller with a uiwebview displaying the website. But every time I click on a cell in the table view it leads to a blank web view. What am I doing wrong?

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"showWebsite"]) {

        UITableViewCell *cell = (UITableViewCell*)sender;
        NSURL *url = [NSURL URLWithString:cell.textLabel.text];
        NSString *string = url.absoluteString;
        SecondViewController *vc = [segue destinationViewController];
        vc.url = string;