remove unused functions

src/repr/bitboard.rs

@@ -90,23 +90,14 @@ impl BitBoard {
         Self(mask)
     }
 
-    // Check if a BitBoard contains a coordinate
-    pub const fn contains(&self, coord: CoordPair) -> bool {
-        (self.0 & (1 << coord.0)) != 0
-    }
-
     // Create a BitBoard from a single coordinate
     pub const fn from_coord(coord: CoordPair) -> Self {
         Self(1 << coord.0)
     }
 
-    pub fn intersects(self, other: Self) -> bool {
+    pub const fn intersects(self, other: Self) -> bool {
         (self.0 & other.0) > 0
     }
-
-    pub fn union(self, other: Self) -> Self {
-        self | other
-    }
 }
 
 impl std::ops::Not for BitBoard {