Function Composition

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"Function Composition" is a method to create new function by taking output of one function and giving it as input to another. In order to compose two functions f and g into f.g, it is necessary that the output type of g and the input type of f are same. You have a lot of functions lying around and you decided to compose them into a single meaningful function. It is given that for any two functions

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solution.cppC++17

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