int startの書く場所がわかりません。コンパイルできません。

前提

　MT4でリピート系のEAを作っています。
int start の場所が悪いようですが、どこに書き換えてもエラーとなってしまいます。(今はVoid on tickの下に書いています)

実現したいこと

ソースコードを整えてコンパイルできるようにする。

発生している問題・エラーメッセージ

'start' - function declarations are allowed on global, namespace or class scope only

該当のソースコード

MQ4
1#property copyright "aaaa"
2#property link      "https://www.mql5.com"
3#property version   "1.00"
4
5
6//変数の宣言
7extern bool Start_Program = false;
8
9extern int Magic = 9696;
10
11extern double Lots = 0.1;
12
13extern int TP = 100;
14extern int SL = 100;
15
16extern int Interval = 50;
17extern int Slippage = 10;
18
19extern string Comments = "Repeat Order";
20
21int Ticket = 0;
22
23double Pips =0;
24int Adjusted_Slippage =0;
25
26  //関数の定義
27double AdjustPoint(string Currency)
28{
29  int Calculated_Digits =
30  (int)MarketInfo(Symbol(),MODE_DIGITS);
31  
32  if(Calculated_Digits == 2 || Calculated_Digits == 3)
33    {
34      double Calculated_Point = 0.01;
35    }
36  else if(Calculated_Digits == 4 ||
37             Calculated_Digits == 5)
38           {
39             Calculated_Point = 0.0001;
40           }
41           
42  return(Calculated_Point);
43}
44
45int AdjustSlippage(string Currency,int Slippage_Pips)
46{
47  int Calculated_Digits =
48  (int)MarketInfo(Symbol(),MODE_DIGITS);
49  
50  if(Calculated_Digits == 2 || Calculated_Digits == 4)
51    {
52      int Calculated_Slippage = Slippage_Pips;
53    }
54  else if(Calculated_Digits == 3 ||
55             Calculated_Digits == 5)
56           {
57             Calculated_Slippage = Slippage_Pips * 10;
58           }
59           
60  return(Calculated_Slippage);
61}
62
63
64int init()
65{
66Pips = AdjustPoint(Symbol());
67Adjusted_Slippage =
68AdjustSlippage(Symbol(),Slippage);
69
70return(0);
71}
72
73//+------------------------------------------------------------------+
74//| Expert initialization function                                   |
75//+------------------------------------------------------------------+
76
77//+------------------------------------------------------------------+
78//| Expert deinitialization function                                 |
79//+------------------------------------------------------------------+
80void OnDeinit(const int reason)
81  {
82//---
83   
84  }
85//+------------------------------------------------------------------+
86//| Expert tick function                                             |
87//+------------------------------------------------------------------+
88
89
90
91void OnTick()
92  {
93int start()
94{
95if (Start_Program==true)
96 {
97   if(OrdersTotal()==0)
98    {
99     Ticket=OrderSend(Symbol(),OP_BUY,Lots,Ask,Adjusted_Slippage,0,0,Comments,Magic,0,Magenta);
100     
101     if(Ticket>0)
102      {
103       if(OrderSelect(Ticket,SELECT_BY_TICKET==true)
104        {
105        bool Modified=OrderModify(OrderTicket(),OrderOpenPrice(),OrderOpenPrice()- SL * Pips,
106        OrderOpenPrice()+TP*Pips,OrderExpiration(),clrNONE);
107
108      if(Modified==true)
109      {
110      Ticket=0;
111      }
112     }
113    }
114   }
115  else if(OrdersTotal()>=1)
116       {
117        if(OrderSelect(OrdersTotal()-1,SELECT_BY_POS,MODE_TRADES)==true)
118         {
119         if(Bid<=OrderOpenPrice()-Interval*Pips)
120         {
121          Ticket=OrderSend(Symbol(),OP_BUY,Lots,Ask,Adjusted_Slippage,0,0,Comments,Magic,0,Magenta);
122          
123          if(Ticket>0)
124          {
125          if(OrderSelect(Ticket,SELECT_BY_TICKET)==true
126           {
127            Modified=OrderModify(OrderTicket(),OrderOpenPrice(),OrderOpenPrice()-SL*Pips,
128            OrderOpenPrice()+TP*Pips,OrderExpiration(),clrNONE);
129            
130            if(Modified==true)
131            {
132            Ticket=0;
133            }
134           }
135          }
136         }
137        }
138       }
139     }
140  return(0);
141}
142//---
143   
144  }