Design a function that merges two given strings and returns the merged version as follows: string mergeStrings(const string &a, const string &b); a = "abc" b="def" result = "adbecf". This should be written in 3 files one implementation one header and one main. ************** Please read the result properly. the result should be adbcef but not abcdef. this is the 4th time i am posting this question here. none has answered it correctly