fixed bug where it was not supported for Windows

build.zig

@@ -11,11 +11,9 @@ pub fn build(b: *std.Build) void {
     const exe = b.addExecutable(.{
         .name = "file_organizer",
         .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
             .target = target,
             .optimize = optimize,
-            .imports = &.{
-                .{ .name = "file_organizer", .module = mod },
-            },
         }),
     });
 

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);
 }