refactor the code

.gitmodules

@@ -4,3 +4,6 @@ url = https://github.com/OpenZeppelin/openzeppelin-contracts
 [submodule "dao/dao/Openzeppelin-DAO"]
 path = dao/dao/Openzeppelin-DAO
 url = https://github.com/tamphill/openzeppelin_dao.git
+[submodule "basic/79-hardhat-foundry/lib/openzeppelin-contracts"]
+	path = basic/79-hardhat-foundry/lib/openzeppelin-contracts
+	url = https://github.com/Openzeppelin/openzeppelin-contracts

basic/07-hardhat/contracts/Greeter.sol

@@ -1,9 +1,6 @@
 //SPDX-License-Identifier: Unlicense
 pragma solidity ^0.8.0;
 
-
-
-
 contract Greeter {
   string greeting;
 

basic/07-hardhat/hardhat.config.js

@@ -21,6 +21,11 @@ function mnemonic() {
 module.exports = {
   solidity: '0.8.0',
   networks: {
+    hardhat: {
+      forking: {
+        url: 'https://mainnet.infura.io/v3/'+ process.env.INFURA_ID,
+      }
+    },
     localhost: {
       url: 'http://localhost:8545',
       //gasPrice: 125000000000,  // you can adjust gasPrice locally to see how much it will cost on production

basic/07-hardhat/package.json

@@ -23,5 +23,8 @@
     "hardhat-deploy-ethers": "^0.3.0-beta.13",
     "mocha": "^10.0.0",
     "sol-merger": "^3.1.0"
+  },
+  "dependencies": {
+    "@openzeppelin/contracts": "^5.0.0"
   }
 }

basic/07-hardhat/scripts/deploy.js

@@ -15,10 +15,9 @@ async function main() {
   const Token = await ethers.getContractFactory('SimpleToken');
   const token = await Token.deploy('SimpleToken', 'SimpleToken', 18, 10000000000);
 
-  console.log('Token address:', token.address);
+  console.log('deploy address:', token.address);
 
-  let balance = await token.balanceOf(deployer.address);
-  console.log(balance.toString());
+
 }
 
 // We recommend this pattern to be able to use async/await everywhere

basic/22-zk-snarkjs/.gitignore

@@ -14,3 +14,4 @@ witness.wtns
 witness.json
 proof.json
 proving_key.json
+*//multiplier2_cpp/

basic/22-zk-snarkjs/circom2/Multiplier2.circom

@@ -0,0 +1,16 @@
+pragma circom 2.0.0;
+
+/*This circuit template checks that c is the multiplication of a and b.*/  
+
+template Multiplier2 () {  
+
+   // Declaration of signals.  
+   signal input a;  
+   signal input b;  
+   signal output c;  
+
+   // Constraints.  
+   c <== a * b;  
+}
+
+component main = Multiplier2();

basic/22-zk-snarkjs/circom2/multiplier2.r1cs.json

@@ -0,0 +1,34 @@
+{
+ "n8": 32,
+ "prime": "21888242871839275222246405745257275088548364400416034343698204186575808495617",
+ "nVars": 4,
+ "nOutputs": 1,
+ "nPubInputs": 0,
+ "nPrvInputs": 2,
+ "nLabels": 4,
+ "nConstraints": 1,
+ "useCustomGates": false,
+ "constraints": [
+  [
+   {
+    "2": "21888242871839275222246405745257275088548364400416034343698204186575808495616"
+   },
+   {
+    "3": "1"
+   },
+   {
+    "1": "21888242871839275222246405745257275088548364400416034343698204186575808495616"
+   }
+  ]
+ ],
+ "map": [
+  0,
+  1,
+  2,
+  3
+ ],
+ "customGates": [
+ ],
+ "customGatesUses": [
+ ]
+}

basic/22-zk-snarkjs/circom2/multiplier2.sym

@@ -0,0 +1,3 @@
+1,1,0,main.c
+2,2,0,main.a
+3,3,0,main.b

basic/22-zk-snarkjs/circom2/multiplier2_js/generate_witness.js

@@ -0,0 +1,20 @@
+const wc  = require("./witness_calculator.js");
+const { readFileSync, writeFile } = require("fs");
+
+if (process.argv.length != 5) {
+    console.log("Usage: node generate_witness.js <file.wasm> <input.json> <output.wtns>");
+} else {
+    const input = JSON.parse(readFileSync(process.argv[3], "utf8"));
+
+    const buffer = readFileSync(process.argv[2]);
+    wc(buffer).then(async witnessCalculator => {
+	//    const w= await witnessCalculator.calculateWitness(input,0);
+	//    for (let i=0; i< w.length; i++){
+	//	console.log(w[i]);
+	//    }
+	const buff= await witnessCalculator.calculateWTNSBin(input,0);
+	writeFile(process.argv[4], buff, function(err) {
+	    if (err) throw err;
+	});
+    });
+}