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Find the Index of the First Occurrence in a String

Difficulty: Easy

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.

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Example 1:

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+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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Example 2:

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+Input: haystack = "leetcode", needle = "leeto"
+Output: -1
+Explanation: "leeto" did not occur in "leetcode", so we return -1.
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Constraints:

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