Question: Write a recursive function in c++. string pairPlus(string n); recursively compute a new string where identical chars that are adjacent in the original string are

Write a recursive function in c++.

string pairPlus(string n);

recursively compute a new string where identical chars that are adjacent in the original string are separated from each other by a "++".

pairPlus("hello"); // returns "hel++lo"

pairPlus("xxyy"); // returns "x++xy++y"

pairPlus("aaaa"); // returns "a++a++a++a"

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