In this directory, you should write the program wcat.c and compile it into
the binary wcat.
After doing so, you can run the tests from this directory by running the
run-tests.sh script. If all goes well, you will see:
prompt> ../../tester/run-tests.sh
test 1: passed
test 2: passed
test 3: passed
test 4: passed
test 5: passed
test 6: passed
test 7: passed
prompt>