Added logic to handle constructor for classes

cc_code_preview/Preview/classes.ccl

@@ -2,7 +2,7 @@ public lib Preview.Classes {
     public class Test {
         private var _name: string;
 
-        public constructor(name: string) {
+        constructor(name: string) {
             this._name = name;
         }
 

cc_code_preview/Program/main.ccl

@@ -6,7 +6,7 @@ public lib Main {
     public class Program {
         private var test: Test;
 
-        public constructor() {
+        constructor() {
             this.test = Test(str);
         }