Method find

fem/code_generation.cpp:240–248

        struct CCode {
            static std::vector<string> expressions;
            static int find( std::vector<string> &v, string val ){
                int i = 0;
                for(auto &s : v) {
                    if(s==val)
                        return i;
                    i++;
                }
                return -1;
            }

            static string strip(string s) {
                int n = s.size();