Use the following definition of an IP address:

IP address is a string in the form "A.B.C.D", where A, B, C, and D are
integers ranging from 0 to 255 inclusive. Leading zeros are allowed.
The length of A, B, C, or D can't be greater than 3.

Here are some valid IP addresses:
000.12.12.034
121.234.12.12
23.45.12.56

Here are some invalid IP address:

000.12.234.23.23
666.666.23.23
.213.123.23.32
23.45.22.32.
I.Am.not.an.ip

Given a String containing any combination of characters, determine whether the string is a valid IP.

Note: The Character class has a static method isDigit(char c) that returns true if c is a digit and false otherwise.