cleaned up imports and using directives

Interface.cpp

@@ -71,7 +71,7 @@
 
         case 4: {
             cout << "Exiting...\n";
-            Sleep(2000);
+            sleep_for(seconds(2));
             goto exit;
             break;
         }
@@ -203,7 +203,7 @@
             }
         case 4: {
             std::cout<<"Exiting...";
-            Sleep(2000);
+            sleep_for(seconds(2));
             goto exit;
             break;
         } break;
@@ -383,13 +383,13 @@
         if (ver == "YES" | ver == "Yes" | ver == "yes")
         {
             std::cout<<"Succes! Changes Saved.";
-            Sleep(1000);
+            sleep_for(seconds(1));
             return true;
         }
         else
         {
             std::cout<<"No changes committed.";
-            Sleep(1000);
+            sleep_for(seconds(1));
             return false;
         }
     }

headers/Customer.h

@@ -3,7 +3,6 @@
 #pragma once
 
 #include "Park_time.h"
-#include "data.h"
 
 #include <vector>
 

headers/Interface.h

@@ -1,6 +1,5 @@
 #include "Query.h"
-#include <stdlib.h>
-#include <synchapi.h>
+
 
 using std::cin;
 

headers/Park_time.h

@@ -8,13 +8,10 @@
 #include <ctime>
 #include <thread>
 
-
 using namespace std::chrono;
 using std::cout;
 using std::flush;
-using std::string;
 using std::to_string;
-using std::chrono::milliseconds;
 using std::this_thread::sleep_for;
 /*