28 .Find the Index of the First Occurrence in a String | Leetcode Top 150 Interview 

Find the Index of the First Occurrence in a String | Leetcode Top 150 Interview
Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
Example 1:
Input: haystack = "sadbutsad", needle = "sad"
Output: 0
Explanation: "sad" occurs at index 0 and 6.
The first occurrence is at index 0, so we return 0
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