Return a defanged version of an IP address where every period '.' is replaced with '[.]'. Return null for null input and an empty string for empty input.
Examples:
Input: address = '1.1.1.1'
Output: '1[.]1[.]1[.]1'
Explanation: Each period is replaced with [.]
Input: address = '255.100.50.0'
Output: '255[.]100[.]50[.]0'
Explanation: Each period is replaced with [.]
Input: address = '192.168.0.1'
Output: '192[.]168[.]0[.]1'
Explanation: Each period is replaced with [.]
Input: address = null
Output: null
Explanation: Null input returns null
Input: address = ''
Output: ''
Explanation: Empty string returns empty string
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