chore: remove the singles function from the common interface

games/src/ataxx/moves.rs

@@ -1,5 +1,10 @@
 use super::{BitBoard, Square};
-use crate::interface::RepresentableType;
+use crate::interface::{BitBoardType, RepresentableType};
+
+pub fn singles(bb: BitBoard) -> BitBoard {
+    let bar = bb | bb.east() | bb.west();
+    bar | bar.north() | bar.south()
+}
 
 /// single returns the targets of a singular Move from the given Square.
 /// ```

games/src/ataxx/position.rs

@@ -224,7 +224,7 @@ impl PositionType for Position {
         // Pieces can only move to unoccupied Squares.
         let allowed = !(stm | xtm | gap);
 
-        for target in stm.singles() & allowed {
+        for target in moves::singles(stm) & allowed {
             movelist.push(Move::new_single(target));
         }
 
@@ -261,7 +261,7 @@ impl PositionType for Position {
         let allowed = !(stm | xtm | gap);
 
         // Count the number single moves in the Position.
-        let mut moves: usize = (stm.singles() & allowed).cardinality();
+        let mut moves: usize = (moves::singles(stm) & allowed).cardinality();
 
         for piece in stm {
             // There may be multiple jump moves to a single Square, so they need to be

games/src/interface/bitboard.rs

@@ -142,11 +142,6 @@ where
         }
     }
 
-    fn singles(self) -> Self {
-        let bar: Self = ((self | self.east()).into() | self.west()).into();
-        ((bar | bar.north()).into() | bar.south()).into()
-    }
-
     /// file returns a Self containing all the squares from the given <Self::Square as Square>::File.
     fn file(file: <Self::Square as SquareType>::File) -> Self {
         Self::from(Self::FIRST_FILE.into() << file.into())