Modify cat_dot() from the previous exercise to take a string to be used as the separator (rather

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Modify cat_dot() from the previous exercise to take a string to be used as the separator (rather than dot) as its third argument.


Data from Previous Exercise

Write a function, string cat_dot(const string& s1, const string& s2), that concatenates two strings with a dot in between. For example, cat_ dot("Niels", "Bohr") will return a string containing Niels.Bohr.

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