core: slim down `common.hpp`

Change-Id: I875c35147edd2261fbaa24e809c170d5cd9b94d3
diff --git a/tests/daemon/fw/multicast-strategy.t.cpp b/tests/daemon/fw/multicast-strategy.t.cpp
index a69c3a5..aa18cdf 100644
--- a/tests/daemon/fw/multicast-strategy.t.cpp
+++ b/tests/daemon/fw/multicast-strategy.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -173,7 +173,7 @@
 
   // downstream retransmits frequently, but the strategy should not send Interests
   // more often than DEFAULT_MIN_RETX_INTERVAL
-  scheduler::EventId retxFrom4Evt;
+  ndn::scheduler::EventId retxFrom4Evt;
   size_t nSentLast = strategy.sendInterestHistory.size();
   auto timeSentLast = time::steady_clock::now();
   std::function<void()> periodicalRetxFrom4; // let periodicalRetxFrom4 lambda capture itself