Object ownership in stringWithString and initWithString in NSString

//header file has appropriate declarations but not included here:
#import "AddressCard.h"

@implementation AddressCard;

-(NSString *) name
{
   return name;
}

//Recommended code:
-(void) setName: (NSString *) theName
{
   [name release]
   name = [[NSString alloc] initWthString: theName];
}

//Incorrect code according to Kochan:
-(void) setName: (NSString *) theName
{
   [name release]
   name = [NSString stringWthString: theName];
}

//rest of class implementation code snipped
@end

-(void) setName: (NSString *) theName
{
   if (theName == name) return; // if they're equal, no need to do anything further
   [name release];
   name = [theName copy];  // sets name to nil if theName is nil
}

name = [[NSString stringWithString: theName] retain];