Convert String to NSData Json Object, Objective-C

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//gcc 5.0.4

#import <Foundation/Foundation.h>

@interface Util:NSObject
- (NSData *)parseJson:(NSString *) jsonstring;
@end
    
int main (int argc, const char * argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    
    NSString* data = @" [  {  \"ID\":1,\"idSort\" : 0,\"deleted\":0,\"storyboardName\" : \"MLMember\",\"dispalyTitle\" : \"76.360779\",\"rightLevel\" : \"10.010490\",\"showTabBar\" : 1,\"openWeb\" : 0,\"webUrl\":\"\"},{\"ID\":10,\"idSort\" : 0,\"deleted\":0,\"storyboardName\" : \"0.00\",\"dispalyTitle\" : \"76.360779\",\"rightLevel\" : \"10.010490\",\"showTabBar\" : 1,\"openWeb\" : 0,\"webUrl\":\"\"}]";
    Util *util = [[Util alloc]init];
    NSData* obj = [util parseJson:data];
    
    NSError *jsonError;
    id allKeys = [NSJSONSerialization JSONObjectWithData:obj options:NSJSONWritingPrettyPrinted error:&jsonError];
    int i = 0;
    for (i=0; i<[allKeys count]; i++) {
        NSDictionary *arrayResult = [allKeys objectAtIndex:i];
        NSLog(@"name=%@",[arrayResult objectForKey:@"storyboardName"]);
        NSLog(@"ID=%@",[arrayResult objectForKey:@"ID"]);

}
    
    [pool drain];
    return 0;
}
@implementation Util
- (NSData *)parseJson:(NSString *) jsonstring
{
    NSString* jsonString = jsonstring;
    NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    return jsonData;   
}
@end

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Compilation time: 0.33 sec, absolute running time: 0.1 sec, cpu time: 0.08 sec, memory peak: 9 Mb, absolute service time: 0,44 sec