NSURL encoder method

Original Click Link in Vast Address:
https://pubads.g.doubleclick.net/aclk?sa=L&ai=BdfOYlWISVvqCNKHCigbmuqqwDvfghqUHAAAAEAEgj7HeJTgAWPe_sKeIAmCZ_p6GuCG6AQs2MjR4MzUyX3htbMgBBdoBBWh0dHA6qQLJEUw6UHOWPsACAuACAOoCFC8xMzEzMDI0MDcvVXptYW5fRGt5-AL00R6QA4QHmAOEB6gDAdAEkE7gBAGQBgGgBiPYBwE&num=0&cid=5GiA4dbgVIIqU0_K1YSfhp0p&sig=AOD64_2jZs8KzvPyO36Me9cwZ57vxKyzPw&client=ca-pub-3069068742246799&adurl=http://dkykartal.com/%3Futm_source%3DUzmanTV%26utm_medium%3DVideo_PreRoll%26utm_content%3DDKY_Kartal%26utm_campaign%3DDKY_Kartal_IBillBoard

Encoded with objc :
https://pubads.g.doubleclick.net/aclk?sa=L&ai=BdfOYlWISVvqCNKHCigbmuqqwDvfghqUHAAAAEAEgj7HeJTgAWPe_sKeIAmCZ_p6GuCG6AQs2MjR4MzUyX3htbMgBBdoBBWh0dHA6qQLJEUw6UHOWPsACAuACAOoCFC8xMzEzMDI0MDcvVXptYW5fRGt5-AL00R6QA4QHmAOEB6gDAdAEkE7gBAGQBgGgBiPYBwE&num=0&cid=5GiA4dbgVIIqU0_K1YSfhp0p&sig=AOD64_2jZs8KzvPyO36Me9cwZ57vxKyzPw&client=ca-pub-3069068742246799&adurl=http://dkykartal.com/%253Futm_source%253DUzmanTV%2526utm_medium%253DVideo_PreRoll%2526utm_content%253DDKY_Kartal%2526utm_campaign%253DDKY_Kartal_IBillBoard%0A%20%20%20%20%20%20%20

Encoder Method:

-(NSURL *)createUrlWithGivenString:(NSString *)string{
    NSArray* components = [string componentsSeparatedByString:@"&"];
    
    NSString * urlString = @"";

    for (NSString* str in components)
    {
        NSArray* keyval = [str componentsSeparatedByString:@"="];
        // keyval[0] is your key
        // keyval[1] is your value
        
        NSString *key1= [keyval[0] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        NSString *key2= [keyval[1] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        
        urlString = [urlString stringByAppendingString:key1];
        
        urlString = [urlString stringByAppendingString:@"="];
        
        urlString = [urlString stringByAppendingString:key2];
        
        urlString = [urlString stringByAppendingString:@"&"];
        
    }
    //removing Last & character which is not necessarry
    urlString = [urlString substringToIndex:[urlString length]-1];
    
    return [NSURL URLWithString:urlString];
    
}