Typo in files/ file

files/hw6.txt

 ./hw6/task2/src/main.rs
 ./hw6/task2/src/shell.rs
 ./hw6/task2/src/command.rs
-./hw6/task2/src/unit_tests_shell    
+./hw6/task2/src/unit_tests_shell.rs
 
 ./hw6/simu1/ANSWERS.md
 ./hw6/simu1/QUESTIONS.md