Provide a software solution for the following: A file filter reads an input file, transforms it in some way, and writes the results to an output file. Write an abstract file filter class that defines a pure virtual function for transforming a character. Create a derived class of your file filter class that transforms a file to all uppercase. The class should have the following member function: void doFilter (ifstream &in, ofstream &out) This function should be called to perform the actual filtering. The member function for transforming a single character should have the prototype: char transform (char ch)