change bits and pieces everywhere about var meta

examples/hello.ry

@@ -1,36 +1,12 @@
-const (
-    test_var = 1 + 3
-)
-
 fn f() i32 {
-    // var a = 3;
-    // return a;
-    return 2;
+    var a = 3;
+    return a;
 }
 
 fn f2() i32 {
     return f() + 2;
 }
 
-//fn f2() bool {
-//    return 1 > 10;
-//}
-
-enum B {
-    a
-    b
-    c
-}
-
-enum C {
-    blah
-    bluh
-}
-
-fn test_function() B {
-    return B.b;
-}
-
 fn func_refer_param(b: i32) i32 {
     return b * 231 + b;
 }
@@ -52,10 +28,6 @@ fn add(a: i32, b: i32) i32 {
     return a + b;
 }
 
-fn and_fn() bool {
-    return true and false;
-}
-
 // type is void by default
 //fn main() {
 //    print("piss\n");