solomongamid / 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 last 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.