How to identify and remove newline and white spaces?
for (int i=0;i<contentsOfFile.count; i++)
 {
        if(!([[contentsOfFile objectAtIndex:i]isEqual:@"n"]||[[contentsOfFile     objectAtIndex:i]isEqual:@""]))
       [arrayToBereturned addObject:[contentsOfFile objectAtIndex:i]];
 }

NSString *string = @"Hello, World!";
NSCharacterSet *separator = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSArray *stringComponents = [string componentsSeparatedByCharactersInSet:separator];

NSString* result = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];