Masking Personal Information

You are given a personal information string s, representing either an email address or a phone number. Return the masked personal information using the rules below.

Email address:

An email address is:

• A name consisting of at least two uppercase and lowercase English letters, followed by
• The '@' symbol, followed by
• The domain consisting of uppercase and lowercase English letters with a dot '.' somewhere in the middle, not as the first or last character.

To mask an email:

• The uppercase letters in the name and domain must be converted to lowercase letters.
• The middle letters of the name, meaning all but the first and last letters, must be replaced by 5 asterisks "*****".

Phone number:

A phone number is formatted as follows:

• The phone number contains 10-13 digits.
• The last 10 digits make up the local number.
• The remaining 0-3 digits, in the beginning, make up the country code.
• Separation characters from the set {'+', '-', '(', ')', ' '} separate the above digits in some way.

To mask a phone number:

• Remove all separation characters.
• The masked phone number should have the form:
• "***-***-XXXX" if the country code has 0 digits.
• "+*-***-***-XXXX" if the country code has 1 digit.
• "+**-***-***-XXXX" if the country code has 2 digits.
• "+***-***-***-XXXX" if the country code has 3 digits.
• "XXXX" is the last 4 digits of the local number.