darn clippy

src/board.rs

@@ -12,6 +12,7 @@ pub struct Board {
 }
 
 impl fmt::Display for Board {
+    #[allow(clippy::repeat_once)] // clippy gets mad about when PADDING == 1
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let horiz_sep_line = "-".repeat(BOARD_SIZE * 2 + 1);
         const PADDING: usize = (BOARD_SIZE - 1).ilog10() as usize + 1;