Enter your c4eng directory by using the cd command like so:

cd src/fall2023/c4eng/

Now make a directory for the project gtf0 using the mkdir command:

mkdir gtf0

And use cd to enter it.

You can now use the grabit command to get the project files for gtf0:

grabit c4eng gtf0

You can use ls to check that the correct files are there. You should see 2 files, Makefile and gtf0.c.