Write an O(n) time program that prompts the user to entertwo strings and tests whether the second string is a substring of the first string.Suppose the neighboring characters in the string are distinct. (Don’t use theindexOf method in the String class.) Here is a sample run of the program: Enter a string s1: Welcome to Java ↵EnterEnter a string s2: come ↵Entermatched at index 3

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