Answer Posted / Arti Sharma

'Test Case 1: haystack = "abcdef", needle = "a" => result should be 0nTest Case 2: haystack = "abcdef", needle = "xyz" => result should be nullnTest Case 3: haystack = "apple", needle = "pple" => result should be 1nTest Case 4: haystack = "", needle = "a" => result should be null'

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