Daily Challenge (137 Part Series)
Given a phone number of integer length
N (1 ≤ N ≤ 10) as a number string (e.g.
555-555-5555 would be passed as
"5555555555"), return an array of all phone numbers as number strings that would be considered neighbors of that phone number (which is any numbers ±1).
For example: someone with the phone number
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