fixed fs_strength.cpp

#include <vector>

#include <cmath>

using namespace std;

//using namespace std;

struct OutData {

    double I;

    }

    void import_iv_from_ivcat_to_storage(std::string filename) {

        uint64_t ptr = 0;

        std::ifstream f;

        f.open(filename);

        std::ifstream f(filename);

        if (!f){

            std::cerr<<"file not found";

        }

        //f.open(filename);

        std::string line;

        while(std::getline(f, line)) {

            if(line.front() == '#') {

    ToughnessCounter ac(ivs, Nx);

    ac.accumulate_strength();

    ac.export_strength("strength");

    ac.export_strength("strength_check");

}