updates

updates

updates from Mac

fix the issue.

check issue from std::stoi

clean the code.

first complete version.

fix some errors.

fix aggregate CPU information.

update linuxParser::CpuUtilization function.

fix uptime and memory%.

fix ram unit issue.

fix runningProcesses issue.

edit system::Process().

update format.cpp, linux_parser.cpp and system.cpp

Merge pull request #2 from xiongyu1988/main

update CpuUtilization().

Merge pull request #1 from xiongyu1988/main

edit linux_parser.cpp

update some code.

update some code.

enable TotalProcesses function.

Finish memory utilization function.

enable OperatingSystem information.