Method jsonFile

example/lottie2gif.cpp:142–149

    }

    bool jsonFile() {
        std::string extn = ".json";
        if ( fileName.size() <= extn.size() ||
             fileName.substr(fileName.size()- extn.size()) != extn )
            return false;

        return true;
    }

    int result() {
        std::cout<<"Generated GIF file : "<<gifName<<std::endl;