https://learn.hackerearth.com/forum/134/there-is-a-string-like-abcde12345-convert-it-in-form-of/https://learn.hackerearth.com/forum/134/there-i
阅读背景：
Given an array [a1b2c3d4] convert to [abcd1234] with 0(1) space and O(n) time
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