We build block
by block.

fn main(){
println!("Rust is fast!");
}

fn main(){
let thread1 = thread::spawn(|| {
for k in 1..11 {
println!("In thread1, executing round is {}", k);
thread::sleep(Duration::from_millis(2000));
}
});
for i in 1..6 {
println!("In main, executing round is {}", i);
thread::sleep(Duration::from_millis(500));
}
thread1.join().unwrap();
}

function pickWinner() public {
require(manager == msg.sender, "You are not the manager");
require(players.length > 3, "Players are less then 3");
uint r = random();
uint index = r%players.length;
winner = players[index];
winner.transfer(getBalance());
players = new address payable[](0);
}