Merge branch 'refactor' of github.com:YuLiu98/abacus-develop into refactor

Author: YuLiu98

source/module_elecstate/occupy.cpp

@@ -141,10 +141,12 @@ void Occupy::iweights(
 {
     assert(is < 2);
     double degspin = 2.0;
-    if (PARAM.inp.nspin == 4)
+    if (PARAM.inp.nspin == 4) {
         degspin = 1.0;
-    if (is != -1)
+}
+    if (is != -1) {
         degspin = 1.0;
+}
 
     double ib_mind = nelec / degspin;
     int ib_min = std::ceil(ib_mind);
@@ -224,8 +226,9 @@ void Occupy::gweights(const int nks,
     for (int ik = 0; ik < nks; ik++)
     {
         // mohan add 2011-04-03
-        if (is != -1 && is != isk[ik])
+        if (is != -1 && is != isk[ik]) {
             continue;
+}
 
         for (int ib = 0; ib < PARAM.inp.nbands; ib++)
         {
@@ -399,8 +402,9 @@ double Occupy::sumkg(const ModuleBase::matrix& ekb,
     double sum2 = 0.0;
     for (int ik = 0; ik < nks; ik++)
     {
-        if (is != -1 && is != isk[ik])
+        if (is != -1 && is != isk[ik]) {
             continue;
+}
 
         double sum1 = 0.0;
         for (int ib = 0; ib < nband; ib++)