Using C++ programming

3. (13\%) Write a recursive function string removeX(string str); that returns a string which is the contents of st x but with all letter ' x ' removed. For example, the function call removeX ("xaxbxc") returns "abc", removeX("abXcd") returns "abXcd", and removeX ("xxxxxxX") returns "". You are not allowed to use any for-loop, whileloop, or do-while-loop in your function. Hint: you can use str. substring (i) to extract a substring of str from index i till the end. For example, suppose str contains "abcdefgh", then sub. substring (3) returns "defgh