Move Zeroes

Problem

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.

Notice: You must do this in-place without making a copy of the array. Minimize the total number of operations.

Example

Given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].