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831\. Masking Personal Information

Medium

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

**Email address:**

An email address is:

*   A **name** consisting of 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 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** (i.e., 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**.

**Example 1:**

**Input:** s = "[email protected]"

**Output:** "l\*\*\*\*\*[email protected]"

**Explanation:** s is an email address. 

The name and domain are converted to lowercase, and the middle of the name is replaced by 5 asterisks.

**Example 2:**

**Input:** s = "[email protected]"

**Output:** "a\*\*\*\*\*[email protected]"

**Explanation:** s is an email address. 

The name and domain are converted to lowercase, and the middle of the name is replaced by 5 asterisks. 

Note that even though "ab" is 2 characters, it still must have 5 asterisks in the middle.

**Example 3:**

**Input:** s = "1(234)567-890"

**Output:** "\*\*\*-\*\*\*-7890"

**Explanation:** s is a phone number. 

There are 10 digits, so the local number is 10 digits and the country code is 0 digits. 

Thus, the resulting masked number is "\*\*\*-\*\*\*-7890".

**Constraints:**

*   `s` is either a **valid** email or a phone number.
*   If `s` is an email:
    *   `8 <= s.length <= 40`
    *   `s` consists of uppercase and lowercase English letters and exactly one `'@'` symbol and `'.'` symbol.
*   If `s` is a phone number:
    *   `10 <= s.length <= 20`
    *   `s` consists of digits, spaces, and the symbols `'('`, `')'`, `'-'`, and `'+'`.