Remove DiagoCG Base class

Author: Cstandardlib

source/module_hsolver/diago_cg.h

@@ -13,7 +13,7 @@
 namespace hsolver {
 
 template <typename T, typename Device = base_device::DEVICE_CPU>
-class DiagoCG final : public DiagH<T, Device>
+class DiagoCG final
 {
     // private: accessibility within class is private by default
     // Note GetTypeReal<T>::type will
@@ -36,7 +36,7 @@ class DiagoCG final : public DiagH<T, Device>
         const int& pw_diag_nmax,
         const int& nproc_in_pool);
 
-    ~DiagoCG() override;
+    ~DiagoCG();
 
     // virtual void init(){};
     // refactor hpsi_info