main method for demonstrating copy awesomeness

CopyPropertyMain

#import "ShoppingCart.h"

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        ShoppingCart *cart = [[ShoppingCart alloc] init];
        cart.couponCode = @"1235AB1";
        
        NSMutableArray *items = [[NSMutableArray alloc] init];
        [items addObjectsFromArray:@[@"Book", @"Guitar", @"Sweater", @"Coffee Pot"]];
        
        cart.items = items;
        
        NSLog(@"Our Items before removing: %@", items);
        NSLog(@"Cart Items before removing: %@", cart.items);
        
        [items removeObjectAtIndex:1];
        
        NSLog(@"Our Items after removing: %@", items);
        NSLog(@"Cart Items after removing: %@", cart.items);
    }
    return 0;
}