Given an email address, mask the local part (everything before the @) so only its first and last characters remain visible, replacing every character in between with an asterisk *. The domain part (the @ and everything after it) is never masked.
If the local part is 2 characters or shorter there is nothing to hide, so return the email unchanged. If the input is null or contains no @ character, return an empty string.
Examples:
Input: email = 'john.doe@example.com'
Output: 'j******e@example.com'
Explanation: The local part 'john.doe' keeps 'j' and 'e' and hides the 6 characters between them
Input: email = 'sam@mail.com'
Output: 's*m@mail.com'
Explanation: Only the single middle character 'a' is hidden
Input: email = 'ab@test.org'
Output: 'ab@test.org'
Explanation: A local part of 2 characters has nothing to hide, so it is returned unchanged
Input: email = null
Output: ''
Explanation: Null input returns an empty string
Input: email = 'nodomain'
Output: ''
Explanation: There is no @ character, so the value is not an email address
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