added constructor for clear board to board.rs

engine/src/bitboard/board.rs

@@ -6,5 +6,23 @@ pub struct Board {
   pinned_squares: [u8; 64], // 0 -> E-W, 1 -> NE-SW, 2 -> N-S, 3 -> SE-NW, 4 -> no pin
   pin_mask: u64,            // 1 -> pin, 0 -> no pin
   en_passant_square: u64,   // 1 -> ep square, 0 -> no ep square
-  side_to_move: u8,         // 0 -> white to play, 1 -> black to play
+  side_to_move: u8          // 0 -> white to play, 1 -> black to play
+}
+
+impl Board {
+
+  pub fn new_clear() -> Self {
+    let mut bit_board: Self = Self {
+      bitboards: [0x0000_0000_0000_0000; 12],
+      piece_board: [12; 64],
+      occupancy: [0x0000_0000_0000_0000; 3],
+      castling_rights: 0b0000_0000,
+      pinned_squares: [4; 64],
+      pin_mask: 0u64,
+      en_passant_square: 0x0000_0000_0000_0000,
+      side_to_move: 0
+    };
+
+    return bit_board;
+  }
 }