refactor: Move data-struct to ds directory

Author: weilycoder

test/static_range_sum.test.cpp

@@ -1,6 +1,6 @@
 #define PROBLEM "https://judge.yosupo.jp/problem/static_range_sum"
 
-#include "../weilycoder/data-struct/static_range_sum.hpp"
+#include "../weilycoder/ds/static_range_sum.hpp"
 #include <cstdint>
 #include <iostream>
 #include <vector>

test/unionfind.test.cpp

@@ -1,6 +1,6 @@
 #define PROBLEM "https://judge.yosupo.jp/problem/unionfind"
 
-#include "../weilycoder/data-struct/unionfind.hpp"
+#include "../weilycoder/ds/unionfind.hpp"
 #include <iostream>
 using namespace std;
 using namespace weilycoder;