You are given an array nums. Your task is to complete the function getXor to return the XOR of the given range a and b.

Example 1:
Input: nums = {1, 3, 5, 7, 9, 11}
,a = 1, b = 3
Output: 1
Explanation: 3^5^7 = 1
Example 2:
Input: nums = {1, 2, 3, 4, 5}
a = 0, b = 4
Output: 1

Your Task:
You don't need to read or print anyhting. Your task is to comlplete the function getXor() which takes nums, a and b as input parameter and returns the xor from a to b.

Expected Time Complexity: O(n)
Expected Space Complexity: O(1)

Constraints:
1 ≤ n ≤ 10^{5}
0 ≤ a ≤ b < n
1 ≤ nums[i] ≤ 100

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