SIM900A + arduino (no library)

How can I send data to with arduino via SIM900A module.I found many libraries and examples but none of them works.I got so many errors.I think new arduino version no longer support the coding system written in the libraries.Can I get the arduino code which doesn’t include any extra library?
Please HELP!

Hello @Ye_min_Aung

Have you tried out with the ArduinoTinyGSM example code?