AUTOCAD 

You can use the CHAMFER command to chamfer an object(with sharp corner) in AutoCAD.

The CHAMFER command is available in the MODIFY panel in the HOME tab.

You can also activate the CHAMFER command by typing the word "CHAMFER" from key board. As soon as you start typing it , the command will appear in the command line and you can click on it to activate(start) it.

Watch the video below to understand how do we work with CHAMFER command,