Commands, updated function head

hw6/task2/src/shell.rs

 }
 
 impl Shell<R, W> {
+    /// Creates a new Shell.
     pub fn new(input: R, output: W, name: String) -> Self {
         Shell {
             reader = input,
             writer = output,
+            should_exit = false,
             name = name,
         }
     }
+    /// Initializes the Shell Loop
+    pub fn start() -> Result<Self, &str> {
+    }
+    /// Waits for user inputs.
+    fn shell_loop() -> Result {
+    }
+    /// Prints the shell prompt.
+    fn prompt() -> Result<Option, &str> {
+    }
+    /// Runs a command.
+    fn run(&str) {
+    }
 }
 
 impl BufRead for Shell<R, W> {