tidy up user prompts

game/entity.rs

@@ -43,12 +43,11 @@ impl Board {
     }
 
     pub fn apply(&mut self, m: Move) -> Result<(), &str> {
-        let i = m.x * 1 + m.y * 3;
-
         if !self.is_valid_move(&m) {
             return Err("invalid move");
         }
 
+        let i = m.x * 1 + m.y * 3;
         self.cells[i] = m.piece;
 
         match self.next {
@@ -68,14 +67,13 @@ impl Board {
 
     pub fn valid_moves_available(&self) -> bool {
         // check for draw condition
-        let mut empty: usize = 0;
         for i in 0..self.cells.len() {
             if self.cells[i] == Cell::Empty {
-                empty += 1;
+                return true;
             }
         }
 
-        empty > 0
+        return false;
     }
 
     pub fn has_winner(&self) -> Option<Cell> {