fix interface test

vlib/v/tests/cstrings_test.v

@@ -1,8 +1,7 @@
-
+fn test_cstring() {
-fn test_cstring(){
+	w := c'world'
-  w := c'world'
+	hlen := C.strlen(c'hello')
-  hlen := C.strlen(c'hello')
+	wlen := C.strlen(w)
-  wlen := C.strlen(w)
+	assert hlen == 5
-  assert  hlen == 5
+	assert wlen == 5
-  assert  wlen == 5
 }

vlib/v/tests/interface_test.v

@@ -22,6 +22,8 @@ fn (d Dog) name() string {
 	return 'Dog'
 }
 
+fn test_todo() {}
+
 /*
 interface Speaker {
 	name ()string