https://leetcode.com/problems/merge-sorted-array/\n\nGiven 2 sorted arrays of integers, one of length n, the other of length 2n where only first half of the array is not empty, sort values of both arrays from smallest to largest and set in the longer array.\n\n**Example 1:**\n```\nInput: a = [1, 3,  ,  ], b = [4, 10]\nOutput: a = [1, 3, 4, 10]\n```

https://leetcode.com/problems/merge-sorted-array/\n\nGiven 2 sorted arrays of integers, one of length n, the other of length 2n where only first half of the arr