modify variable name

Author: dzzz2001

source/module_hamilt_lcao/module_gint/temp_gint/unitcell_info.cpp

@@ -5,9 +5,9 @@ namespace ModuleGint
 {
 
 UnitCellInfo::UnitCellInfo(
-    Vec3d unitcell_vec1,
-    Vec3d unitcell_vec2,
-    Vec3d unitcell_vec3,
+    const Vec3d& unitcell_vec1,
+    const Vec3d& unitcell_vec2,
+    const Vec3d& unitcell_vec3,
     int nbx, int nby, int nbz,
     int nmx, int nmy, int nmz)
     : unitcell_vec1_(unitcell_vec1),

source/module_hamilt_lcao/module_gint/temp_gint/unitcell_info.h

@@ -14,9 +14,9 @@ class UnitCellInfo
     public:
         // constructor
         UnitCellInfo(
-            Vec3d unitcell_vec1,
-            Vec3d unitcell_vec2,
-            Vec3d unitcell_vec3,
+            const Vec3d& unitcell_vec1,
+            const Vec3d& unitcell_vec2,
+            const Vec3d& unitcell_vec3,
             int nbx, int nby, int nbz,
             int nmx, int nmy, int nmz);