fix othello player skip logic

src/agent.rs

@@ -17,10 +17,14 @@ impl Agent for ManualAgent {
     fn next_move(&mut self, _: &Board) -> Option<(usize, usize)> {
         let stdin = io::stdin();
         let mut input = String::new();
-        println!("Your turn!");
+        println!("Your turn! ('Skip' to skip)");
         loop {
             input.clear();
             stdin.lock().read_line(&mut input).ok()?;
+            if input.to_lowercase().trim() == "skip" {
+                // skips move
+                return None;
+            }
 
             let got = input
                 .split_whitespace()