Fixed shebang, check filename, exploitdb default path fur recent kali…

[giper45]

This PR fixes some issues, some of them related with the new kali version:

• Fixed shebang /bin/bash (for zsh shell it gives errors)
• Fixed -z check in file_name array variable (double quotes added)
• Fixed the exploitdb default path (for current kali version (2021) it is /usr/share/exploitdb/exploits/ instead of /usr/share/exploitdb/platforms.
• Fixed file_name in compile step.