1a. Make a application with two threads.
    Let one thread print the text "Hello" 10000 times on separate lines,
    and let the other print "World".

1b. Now do the same, but make the threads print the texts character by character.
    Notice the change in the output.

1c. Keeping the character by character printing, fix 1b.

2.  Two goats are trying to cross a bridge, but they cannot pass each other.
    Instead, they meet in the middle and try to push each other off the bridge.
    To do that, a goat takes its time to gather power (between 0.5 and 2.0 seconds),
    and then moves forward one step, pushing the other goat one step backwards.
    At each push, print the position of the two goats,
    and whenever one of the goats falls off the bridge,
    the application should end, and announce which goat has managed to go through.

    The length of the bridge is given in a command line argument. 

3.  Make an application that acts in a similar way to a telnet client.

    The application gets a machine name and a port number
    as its two command line arguments.
    The application then connects to the port on the machine.
    Supposing the connection can be established, the application does two things simultaneously:
    if the local user types in a line on the standard input,
    the application transmits it to the server;
    in parallel to that, if the application receives a line of text from the server,
    it prints it on the standard input.

4a. Make a parallel chat application.
    The application starts a server on a given port,
    and lets two clients connect through it.
    After that, the two clients can talk to each other without waiting for each other,
    that is, if one of them sends a line of text to the server,
    the application immediately sends the message over to the other client.

4b. Make an application similar to 4a,
    but in this case, the application has to handle any number of clients.
    The clients may arrive at any time, and they might break the connection;
    whenever a client sends a line of message to the server,
    that line has to be immediately sent to all of the available clients.

4c. Same as 4b, but the incoming clients also have a name.
    The clients send their name as the first line of text.
    All clients are notified by a single line message when a new client enters the chat
    and also when a client leaves;
    both types of messages contain the name of the entering/leaving client.

4d. The clients can send the line "/msg <name> <message>",
    which causes the server to transmit the <message> to the client
    identified as <name>. Other clients should not receive the message.