https://www.codewars.com/kata/ip-validation
Write an algorithm that will identify valid IPv4 addresses in dot-decimal format. IPs should be considered valid if they consist of four octets, with values between 0..255 (included).
Input to the function is guaranteed to be a single string.
// valid inputs:
1.2.3.4
123.45.67.89
// invalid inputs:
1.2.3
1.2.3.4.5
123.456.78.90
123.045.067.089
Note: leading zeros (e.g. 01.02.03.04) are considered not valid in this kata!