edit the code from lines 5 to 8 so you can connect to FTP
- ls - display a list of files and folders in the current directory
- cd - change the current directory to the specified path
- rm or del - delete the specified file
- touch or create - create a new file with the specified name
- rmf - delete the specified file without reporting an error if it does not exist,
- exit - exit the program
- fix cd... / cd
- add more features