Properly commented
Fixed segment fault on read

Fixed segment fault error when reading a file, hopefully this time it
will gone.
Changed but still error
Only reading file after file left
Mostly completed
Comment should be completed
Fixed minor displayed problems

Fixed most of the visual problems. Prepare to add colours to the
program.
Finish fixed problem

Fixed minor problems and revived some memory issue problem (clear used
memory). Adjust colour thought terminalr seem not working for now.
Backup before deleting
Esc fixed
Command line argument added
Add current file name
Optimised backspace in command mode
Optimised backspace key