text: #ifndef SYSTEM_H
  #define SYSTEM_H
  
  #include <string>
  #include <vector>
  
  #include "process.h"
  #include "processor.h"
  
  class System {
   public:
    System();
    Processor& Cpu();
    std::vector<Process>& Processes();
    float MemoryUtilization();
    long UpTime();
    int TotalProcesses();
    int RunningProcesses();
    std::string Kernel();
    std::string OperatingSystem();
  
   private:
    Processor cpu_ = {};
    std::vector<Process> processes_ ;
    std::string kernel_ , os_;
  };
  
  #endif