material printout added but doesn't work yet

src/G4System.cc

@@ -1,5 +1,8 @@
 
 #include "G4System.hh"
+#include <G4Material.hh>
+#include <G4NistManager.hh>
+#include <G4String.hh>
 
 void G4System::init(ConstructionWrapper &CW){
 
@@ -122,6 +125,12 @@ void G4System::run_visualize(const std::string& partSpecies, double minEnergy, d
   runManager->BeamOn(1);
 }
 
+void G4System::printMaterial(const std::string& materialName)const{
+    // Get the material from the material name
+    return ; //ToDo
+}
+
+
 void G4System::run_gui(){
     if(ui == nullptr){
         throw std::runtime_error("GUI not initialized");