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After a lit bit of debugging, I think I've caught the rest. Like hlt said, you need and you keep getting your original number back. Also, thanks to hlt, you had a piece of missing logic regarding zero length string inputs. I said to start that I think I've caught the rest of the bugs, but that may not be true.
I'd recommend writing some tests with a large number of numbers with different characteristics (eg 1, 12121212, 0000, 1222, 2221, etc) and their expected results.
Also on display is the latest family of Apple computers and accessories.
We are happy to special order any related item that we might not carry and to have it available, often by the next day, for your convenience.