FUNCTION: str_search DESCRIPTION: takes two C strings: a "source string" s[] and a "pattern string" and determines if the given pattern is a substring of s. If the pattern is a substring of s, the index into s where the first match occurs is returned (note that the pattern may occur multiple times in s). Otherwise, -1 is returned (note that a match could start at index 0, so we can't use 0 for "false"). Estimated Difficulty: LEVEL 3 Examples: source string s pattern return-value "abcd" "ab" "abcd" "aa" -1 "abc bc d" "bc" 1 "abcd" "bcd" "abcd" "bcd" "abracadabra" "dab" 6. "abc" "abc" "abc" "abcd" NOTES: every string is a substring of itself if the pattern is longer than the source string, of course there can be no match. - remember there may be multiple matches - you want the index of the first match. You may use the strlen library function (but you don't really need it) but all other library functions RULES:

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