diff --git a/src/SysYBuilder/SysYBuilder.cpp b/src/SysYBuilder/SysYBuilder.cpp
index 8af141c..96b6944 100644
--- a/src/SysYBuilder/SysYBuilder.cpp
+++ b/src/SysYBuilder/SysYBuilder.cpp
@@ -3,7 +3,7 @@
 #define CONST_INT(num) ConstantInt::get(num, module.get())
 #define CONST_FLOAT(num) ConstantFloat::get(num, module.get())
 
-// You can define global variables here
+// You can define global variables and functions here
 // to store state
 
 // store temporary value
@@ -29,86 +29,46 @@ void SysYBuilder::visit(SyntaxTree::Assembly &node) {
     }
 }
 
-void SysYBuilder::visit(SyntaxTree::InitVal &node) {
-    return;
-}
+// You need to fill them
 
-void SysYBuilder::visit(SyntaxTree::FuncDef &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::InitVal &node) {}
 
-void SysYBuilder::visit(SyntaxTree::FuncFParamList &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::FuncDef &node) {}
 
-void SysYBuilder::visit(SyntaxTree::FuncParam &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::FuncFParamList &node) {}
 
-void SysYBuilder::visit(SyntaxTree::VarDef &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::FuncParam &node) {}
 
-void SysYBuilder::visit(SyntaxTree::AssignStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::VarDef &node) {}
 
-void SysYBuilder::visit(SyntaxTree::LVal &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::LVal &node) {}
 
-void SysYBuilder::visit(SyntaxTree::Literal &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::AssignStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::ReturnStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::Literal &node) {}
 
-void SysYBuilder::visit(SyntaxTree::BlockStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::ReturnStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::EmptyStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::BlockStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::ExprStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::EmptyStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::UnaryCondExpr &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::ExprStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::BinaryCondExpr &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::UnaryCondExpr &node) {}
 
-void SysYBuilder::visit(SyntaxTree::BinaryExpr &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::BinaryCondExpr &node) {}
 
-void SysYBuilder::visit(SyntaxTree::UnaryExpr &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::BinaryExpr &node) {}
 
-void SysYBuilder::visit(SyntaxTree::FuncCallStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::UnaryExpr &node) {}
 
-void SysYBuilder::visit(SyntaxTree::IfStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::FuncCallStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::WhileStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::IfStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::BreakStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::WhileStmt &node) {}
 
-void SysYBuilder::visit(SyntaxTree::ContinueStmt &node) {
-    return;
-}
+void SysYBuilder::visit(SyntaxTree::BreakStmt &node) {}
+
+void SysYBuilder::visit(SyntaxTree::ContinueStmt &node) {}