Remove Init() from NullModel.

Processes/NullModel/NullModel.cc

@@ -13,8 +13,6 @@
 using namespace corsika;
 namespace corsika::process::null_model {
 
-  void NullModel::Init() {}
-
   NullModel::NullModel(units::si::LengthType maxStepLength)
       : fMaxStepLength(maxStepLength) {}
 

Processes/NullModel/NullModel.h

@@ -20,8 +20,6 @@ namespace corsika::process::null_model {
     NullModel(corsika::units::si::LengthType maxStepLength =
                   corsika::units::si::meter * std::numeric_limits<double>::infinity());
 
-    void Init();
-
     template <typename Particle, typename Track>
     process::EProcessReturn DoContinuous(Particle&, Track&) const;
 

Processes/NullModel/testNullModel.cc

@@ -44,7 +44,6 @@ TEST_CASE("NullModel", "[processes]") {
 
     NullModel model(10_m);
 
-    model.Init();
     [[maybe_unused]] const process::EProcessReturn ret =
         model.DoContinuous(particle, track);
     LengthType const length = model.MaxStepLength(particle, track);