[lab2]checkopint with "while, continue, break" not implemented

test/10_test.sy

@@ -1,7 +1,7 @@
 //test file for backend lab
 
 int main() {
-  int a;
+  int a = 1;
   const int b = 2;
   int c;
   

test/11_add2.sy

@@ -7,7 +7,7 @@ int mul(int x, int y) {
 int main(){
     int a, b;
     a = 10;
-    b = 0;
+    b = 3;
     a = mul(a, b);
     return a + b;
 }