[LeetCode] 28. Find the Index of the First Occurrence in a String (Easy)

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class Solution {
    public int strStr(String haystack, String needle) {

        for(int i = 0; i <= haystack.length() - needle.length(); i++) {
            String temp = haystack.substring(i, i + needle.length());
            if(temp.equals(needle)) return i;
        }

        return -1;
    }
}