consider the following function
make the codes as simple as posible https://s3.us-east-1.amazonaws.com/blackboard.learn.xythos.prod/584b12a1a0ed8/3745025?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Program5.pdf&response-content-type=application%2Fpdf&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200411T001901Z&X-Amz-SignedHeaders=host&X-Amz-Expires=21600&X-Amz-Credential=AKIAIL7WQYDOOHAZJGWQ%2F20200411%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=ba18c7fe1b70aa62aaa441b3a94c177693d14f7503d7effa9fb9b24d3c8809df
