fixed bug where it was not supported for Windows

src/organize.zig

@@ -19,6 +19,7 @@ fn placeFile(io: std.Io, dir: std.Io.Dir, category: classify.Category, name: []c
     try dir.createDirPath(io, dest);
 
     var buf: [std.fs.max_path_bytes]u8 = undefined;
-    const path = try std.fmt.bufPrint(&buf, "{s}/{s}", .{ dest, name });
+    var fba = std.heap.FixedBufferAllocator.init(&buf);
+    const path = try std.fs.path.join(fba.allocator(), &.{ dest, name });
     try dir.rename(name, dir, path, io);
 }