fixed compiling issue

Author: Thidas Senavirathna

src/main/java/com/mycmd/Command.java

@@ -1,32 +1,14 @@
 package com.mycmd;
 
-import java.io.IOException;
+import com.mycmd.ShellContext;
 
-/**
- * Represents a shell command that can be executed inside the MyCMD shell.
- * Implementations perform their operation when {@link #execute(String[], ShellContext)} is called.
- */
 public interface Command {
+    String getName();
+    String getDescription();
     /**
      * Execute the command.
-     *
-     * @param args    command-line style arguments passed to the command. May be empty but will not be null.
-     * @param context current shell context containing state such as the current working directory.
-     * @throws IOException if the command cannot complete successfully.
+     * @param context shell context
+     * @param args command arguments
      */
-    void execute(String[] args, ShellContext context) throws IOException;
-
-    /**
-     * Short description of the command. Default is empty so existing implementations do not break.
-     */
-    default String description() {
-        return "";
-    }
-
-    /**
-     * Usage string for the command. Default is empty.
-     */
-    default String usage() {
-        return "";
-    }
+    void execute(ShellContext context, String[] args) throws Exception;
 }

src/main/java/com/mycmd/ShellContext.java

@@ -2,18 +2,23 @@
 
 import java.io.*;
 import java.util.*;
+import java.time.Instant;
 
 public class ShellContext {
     private File currentDir;
     private List<String> history;
     private Map<String, String> aliases;
     private static final String ALIAS_FILE = ".mycmd_aliases";
     private static final int MAX_HISTORY = 100;
+    private final List<String> commandHistory;
+    private final Instant startTime;
 
     public ShellContext() {
         this.currentDir = new File(System.getProperty("user.dir"));
         this.history = new ArrayList<>();
         this.aliases = new HashMap<>();
+        this.commandHistory = new ArrayList<>();
+        this.startTime = Instant.now();
         loadAliases();
     }
 
@@ -27,6 +32,7 @@ public void setCurrentDir(File dir) {
 
     public void addToHistory(String command) {
         history.add(command);
+        commandHistory.add(command); // Add to command history
         if (history.size() > MAX_HISTORY) {
             history.remove(0);
         }
@@ -36,6 +42,14 @@ public List<String> getHistory() {
         return new ArrayList<>(history);
     }
 
+    public List<String> getCommandHistory() {
+        return commandHistory;
+    }
+
+    public Instant getStartTime() {
+        return startTime;
+    }
+
     public void clearHistory() {
         history.clear();
     }