text: #include "file_helper.hpp"
  #include <iostream>
  #include <fstream>
  #include <iomanip> 
  #include <unistd.h>
  void span_write(const n64_span & s, const std::string & filename){
  
      std::ofstream of(filename, std::ios::out | std::ios::binary);
      of.write((char *) s.begin(), s.size());
      of.close();
  }
  