try to fix macos issue

Author: adampdp

Worm2D.cpp

@@ -2,11 +2,12 @@
 #include <iostream>
 #include <sstream>
 #include <string>
+#include <functional>
+#include <vector>
 //#include <bits/stdc++.h>
 #include "Worm2D.h"
 #include "Mainvars.h"
-#include <functional>
-#include <vector>
+
 
 using std::istringstream;
 using std::string;