change return type of get_nucleus_name() to std::string

corsika/detail/framework/core/ParticleProperties.inl

@@ -147,7 +147,7 @@ namespace corsika {
     return get_mass(Code::Proton) * Z + (A - Z) * get_mass(Code::Neutron);
   }
 
-  inline std::string_view get_nucleus_name(Code const code) {
+  inline std::string get_nucleus_name(Code const code) {
     size_t const A = get_nucleus_A(code);
     size_t const Z = get_nucleus_Z(code);
     return fmt::format("Nucleus_A{}_Z{}", A, Z);

corsika/framework/core/ParticleProperties.hpp

@@ -207,7 +207,7 @@ namespace corsika {
    * @param code
    * @return std::string_view
    */
-  inline std::string_view get_nucleus_name(Code const code);
+  inline std::string get_nucleus_name(Code const code);
 
   /**
    * @brief convert PDG code to CORSIKA 8 internal code.