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Phone Number

Welcome to Phone Number on Exercism's C Track. If you need help running the tests or submitting your code, check out HELP.md.

Instructions

Clean up user-entered phone numbers so that they can be sent SMS messages.

The North American Numbering Plan (NANP) is a telephone numbering system used by many countries in North America like the United States, Canada or Bermuda. All NANP-countries share the same international country code: 1.

NANP numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area code, commonly known as area code, followed by a seven-digit local number. The first three digits of the local number represent the exchange code, followed by the unique four-digit number which is the subscriber number.

The format is usually represented as

(NXX)-NXX-XXXX

where N is any digit from 2 through 9 and X is any digit from 0 through 9.

Your task is to clean up differently formatted telephone numbers by removing punctuation and the country code (1) if present.

For example, the inputs

+1 (613)-995-0253
613-995-0253
1 613 995 0253
613.995.0253

should all produce the output

6139950253

Note: As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.

Source

Created by

@RealBarrettBrown

Contributed to by

@bcc32
@Gamecock
@gea-migration
@h-3-0
@mikewalker
@patricksjackson
@QLaille
@ryanplusplus
@wolf99

Based on

Event Manager by JumpstartLab - http://tutorials.jumpstartlab.com/projects/eventmanager.html

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