Given an array
nums, write a function to move all
0's to the end of it while maintaining the relative order of the non-zero elements.
For example, given
nums = [0, 1, 0, 3, 12], after calling your function,
nums should be
[1, 3, 12, 0, 0].
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
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