[Google Onsite] Chunked Palindrome

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(This question has been seen in the interviews of the following companies: Google)

Normal palindrome is defined as a string that reads the same backwards as forwards, for example "abccba".
Chunked palindrome is defined as a string that you can split into chunks and it will form a palindrome.
For example, "volvo". You can split it into (vo)(l)(vo). Let A = "vo", B = "l", so the original string is ABA which is a palindrome.

Given a string str, find the maximum number of chunks we can split that string to get a chuncked palindrome.

Example 1:

Input: "valve"
Output: 1
Explanation: You can't split it into multiple chunks so just return 1 (valve)
Example 2:
Input: "voabcvo"
Output: 3
Explanation: (vo)(abc)(vo)
Example 3:

Input: "vovo"
Output: 2
Explanation: (vo)(vo)
Example 4:

Input: "volvolvo"
Output: 5
Explanation: (vo)(l)(vo)(l)(vo)
Example 5:

Input: "volvol"
Output: 2
Explanation: (vol)(vol)
Example 6:

Input: "aaaaaa"
Output: 6
Explanation: We can split it into (aaa)(aaa), but the optimal split should be (a)(a)(a)(a)(a)(a)

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