added helper functions for move

src/move.zig

@@ -35,6 +35,36 @@ pub fn playMoves(game: *types.game, str: []const u8) *types.game {
     return game;
 }
 
+pub fn charToSet(g: *types.game, chr: u8) *u64 {
+    return switch (chr) {
+        'P' => &g.white.pawns,
+        'N' => &g.white.knights,
+        'B' => &g.white.bishops,
+        'R' => &g.white.rooks,
+        'Q' => &g.white.queen,
+        'K' => &g.white.king,
+        'p' => &g.black.pawns,
+        'n' => &g.black.knights,
+        'b' => &g.black.bishops,
+        'r' => &g.black.rooks,
+        'q' => &g.black.queen,
+        'k' => &g.black.king,
+        else => {
+            std.log.err("you should not be here ${c}$", .{chr});
+            unreachable;
+        },
+    };
+}
+
 // pub fn pawnMove(arr: std.ArrayList(c.move)) void {
 //     const move = c.move{ .From = 8, .To = 16, .Promo = 0 };
 // }
+fn bitboardToMoves(start: u8, moves: u64, arr: *std.ArrayList(types.move)) void {
+    var lmoves = moves;
+    while (lmoves != 0) {
+        const pos = @ctz(lmoves);
+        const m: types.move = .{ .From = start, .Promo = 0, .To = pos };
+        lmoves = lmoves & ~@as(u64, 1) << @truncate(pos);
+        arr.append(m) catch unreachable;
+    }
+}