iOS NSString -> char[] confusion

NSString *myString = [[NSString alloc] init];
myString = @"ABCDEFGHIJK";
int addressLength = [myString = length];
char buffer[addressLength];
[myString getCharacters:buffer];

	NSLog([@"address for buffer: " stringByAppendingString:[NSString stringWithCharacters:address length:addressLength]]);
	
	NSLog([@"buffer[]: " stringByAppendingString:[NSString stringWithCharacters:buffer length:(11)]]);
	NSLog([@"0: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[0]]]);
	NSLog([@"1: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[1]]]);
	NSLog([@"2: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[2]]]);
	NSLog([@"3: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[3]]]);
	NSLog([@"4: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[4]]]);
	NSLog([@"5: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[5]]]);
	NSLog([@"6: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[6]]]);
	NSLog([@"7: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[7]]]);
	NSLog([@"8: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[8]]]);
	NSLog([@"9: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[9]]]);
	NSLog([@"10: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[10]]]);
	NSLog([@"11: " stringByAppendingString:[NSString stringWithFormat:@"%c", buffer[11]]]);