Use the main.rs as the server
You can run the following programs to manipulate the data inside main.rs:

1. imenik_vpis <name> <surname> <phone number>
creates a new contact with the input data

2. imenik_izbris <phone number>
deletes the contact with the matching phone number

3. imenik_izpis <phone number>
prints the contact with the matching phone number

4. imenik_iskanje
Uses a string to search the phone book for contacts with a matching name or surname
and prints all such matches. Then it waits for the next sting with which to search.
Exit using Ctrl+D.

5. imenik_zapri
closes the socket connection but first it waits for all other requests to be completed