Number of characters to create a palindrome
A palindrome string reads the same backward as well as forward. Given a string, write a function to find the minimum number of characters that need to be inserted in order to convert the string to a palindrome.
Below are some examples:
- aabaa: 0, it's already a palindrome
- abcd: 3, dcb abcd
- abcde: 4, edcb abcde
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