Length of longest palindrome in linked list

Given an linked list which are contain n nodes. Our goal is to find the largest length palindrome which are exist in this linked list. Note that there can be possible more than one palindrome in linked list.

In above image there are more than one palindrome are possible.

3  2  2  3 [Length 4]
2  2 [Length 2]
2  3  1  1  3  2 [Length 6]
3  1  1  3 [Length 4]

Here given code implementation process.

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