step 1: initialize Cloud9 IDE
step 2: follow steps at https://docs.aws.amazon.com/cloud9/latest/user-guide/sample-cplusplus.html
step 3: create C++ file using this as a starting point: https://github.com/awsdocs/aws-doc-sdk-examples/blob/main/cpp/example_code/s3-crt/s3-crt-demo.cpp