First deployment

build/contracts/Migrations.json

@@ -912,6 +912,12 @@
     "version": "0.5.16+commit.9c3226ce.Emscripten.clang"
   },
   "networks": {
+    "5777": {
+      "events": {},
+      "links": {},
+      "address": "0xf27cb3e890F920aB5db54A6Fc39bd14663DFF5Cf",
+      "transactionHash": "0x5748d2eb12351865eb575b03e5c2e0a6a6509aa184c281878df75dc3de5c3e23"
+    },
     "1617704049410": {
       "events": {},
       "links": {},
@@ -923,10 +929,16 @@
       "links": {},
       "address": "0x75d8f3196cCC798380f786073F549A35Da53E400",
       "transactionHash": "0x894561c5f23679cdebc8a3a067eed5a3e15bb288d5002b80ec74feff9c711154"
+    },
+    "1618780535164": {
+      "events": {},
+      "links": {},
+      "address": "0x0B45A4cCC5138EDEFddcc98938D4F019BA31d34c",
+      "transactionHash": "0xa921c3a7658d48b489981b2d94064eed5502a8370a2b3d2de57baec78a143e08"
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-06T12:02:18.519Z",
+  "updatedAt": "2021-05-19T00:16:34.028Z",
   "networkType": "ethereum",
   "devdoc": {
     "methods": {}

contracts/MyToken.sol

@@ -2,16 +2,70 @@
 pragma solidity >=0.4.22 <0.9.0;
 
 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
 
 
 contract MyToken is ERC20 {
     uint8 private _decimal = 5;
-    uint256 private allocate_token = 1000;
-
+    uint256 public allocate_token = 1000000000 * 10 ** uint(_decimal);
+
+    event CustomTransfer (
+        address indexed _from,
+        address indexed _to,
+        uint256 _amount
+    );
+
+    event CustomApproval(
+        address indexed _owner,
+        address indexed _spender,
+        uint256 _amount
+    );
+    mapping(address => uint256) public  balances;
+    mapping(address => mapping(address => uint256)) public  allowances;
+
     constructor() ERC20 ("DavidToken", "DTN") {
-        _mint(msg.sender, allocate_token);
-    }   
+        balances[msg.sender] += allocate_token;  
+    } 
+
+
     function decimals() override public view returns (uint8) {
         return _decimal;
     }
+
+    function totalSupply() override public view returns (uint) {
+        return allocate_token;
+    }
+
+    function returnOwnerBalance() public view returns (uint256) {
+        return balances[msg.sender];
+    }
+
+    function transfer(address _recipient, uint256 _amount) public override returns (bool success) {
+        require(_recipient != address(0), "Error: transfer to the zero address");
+        require(balances[msg.sender] >= _amount, 'Error Insufficient balance in the recepient wallet');
+        balances[msg.sender] -= _amount;
+        balances[_recipient] += _amount;
+        emit CustomTransfer(msg.sender, _recipient, _amount);
+        return true;
+    }
+    function transferFrom(address _sender, address _recipient, uint256 _amount) public override returns (bool success) {
+        require(balances[_sender] >=  _amount);
+        require(_recipient != address(0), "Error: transfer to the zero address");
+        require(_amount <= allowances[_sender][msg.sender]);
+        balances[_sender] -= _amount;
+        balances[_recipient] += _amount;
+        allowances[_sender][msg.sender] -= _amount;
+        emit CustomTransfer(_sender, _recipient, _amount);
+        return true;
+    }
+    function approve(address _spender, uint256 _amount) public override returns (bool success){
+        allowances[msg.sender][_spender] = _amount;
+        emit CustomApproval(msg.sender,_spender,_amount);
+        return true;
+    }
+    function balanceOf( address account) override public view returns (uint256) {
+        return balances[account];
+    }
+
 }

helper.js

@@ -0,0 +1,3 @@
+module.exports = (count) => {
+    return count * 10 ** 5
+}