[CODE] Fix IWYU warnings

cmd/main.cc

@@ -14,6 +14,7 @@
 /// along with SandBox.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <cstdio>
+#include <memory>
 
 #include "sandbox/dummygroup/dummygroup.h"
 

test/test.cpp

@@ -15,6 +15,8 @@
 
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 
+#include <memory>
+
 #include <doctest/doctest.h>
 
 #include "sandbox/dummygroup/dummygroup.h"