Game of String

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You are given 'N' number of string consisting of small letter from 'a' to 'z'. check whether given string is double string or not. A string is called a double string if it can be represented as a concatenation of two identical, non-empty strings. e.g. "abab" is a double string as it can be represented as "ab" + "ab" where + operation denotes concatenation. Similarly, "aa", "abcabc" are double str

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solution.cppC++17

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