Encryption of message

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Avani is working on a secret mission where she can not take the risk of information leakage. She needs to convey a message to her senior but there is a risk of information leakage. So to convey the message securely, she found a way to encrypt the message by shifting the alphabets by 3 alphabets in circular manner of String $S$. Help Avani, by writing code to encrypt her message more easily and fa

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solution.cppC++17

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