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Niklas Schmidtmer
Aug 31, 2013
8c7aee1 · Aug 31, 2013

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Aug 31, 2013

Phone Number

Write a program that cleans up user-entered phone numbers so that they can be sent SMS messages.

The rules are as follows:

  • If the phone number is less than 10 digits assume that it is bad number
  • If the phone number is 10 digits assume that it is good
  • If the phone number is 11 digits and the first number is 1, trim the 1 and use the first 10 digits
  • If the phone number is 11 digits and the first number is not 1, then it is a bad number
  • If the phone number is more than 11 digits assume that it is a bad number

We've provided tests, now make them pass.

Hint: Only make one test pass at a time. Disable the others, then flip each on in turn after you get the current failing one to pass.

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