fix(core): Stabilize build by implementing required command interface methods

[PedrinDev1447]

This commit resolves a massive, project-wide build failure caused by an incomplete Command interface.

The original task was to implement command suggestions in App.java, but this revealed systemic issues. The Command interface was missing key methods for error handling and self-documentation (description() and usage()), which were required by the HelpCommand and the new suggestion logic.

This commit performs the following critical fixes:

1. Updates the Command interface:

   • Added throws IOException to the execute method signature. This allows all file-system commands (like move, del, copy) to handle errors correctly.
   • Added the abstract methods String description() and String usage() to the interface contract.

2. Implements Interface Methods:

   • Iterated through all command classes (DirCommand, CdCommand, ClsCommand, CopyCommand, HelpCommand, MoveCommand, TouchCommand, VersionCommand, etc.) and implemented the required description() and usage() methods.

3. Fixes Dependency Errors:

   • Added the org.apache.commons:commons-lang3 dependency to pom.xml. This provides the StringUtils needed for the command suggestion feature in App.java.
   • Added the missing resolvePath(String path) helper method to ShellContext, which was causing compilation errors in multiple commands.

4. Cleans up App.java:

   • Refactored the 'command not found' logic to correctly display either the standard error or the 'Did you mean?' suggestion, not both.

The project now compiles successfully, the HelpCommand is fully functional, and the foundation is stable for future development.

[anshumanjadiya1102]

Hello @PedrinDev1447, But There are some conflicts with the main branch, So Please resolve them

[PedrinDev1447]

Hi @anshumanjadiya1102
Thank you for the heads-up regarding the merge conflict.

I followed your advice and ran git pull origin main on my improve-error-message branch, followed by a git push. The conflict seems to have been resolved automatically by Git, and the Pull Request is now showing an "Approved" status with no pending conflicts.

If the conflict somehow reappears on GitHub, could you please let me know which specific file or location (path) contains the error? That would help me resolve it quickly.

I believe it's ready to be merged now!

[anshumanjadiya1102]

Hello @PedrinDev1447, There are three conflicts here:

• src/main/java/com/mycmd/Command.java
• src/main/java/com/mycmd/ShellContext.java
• src/main/java/com/mycmd/commands/LsCommand.java