🥓 add function to set USDC balance by jambro

hardhat/set_usdc_balance.js

@@ -0,0 +1,28 @@
+// function to set USDC balance of ethereum mainnet forks by @janbro
+
+
+const { ethers } = require("hardhat");
+
+async function setUSDCBalance(account, balance) {
+    const balances_index = 9;
+    const USDC_ADDRESS = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"; // ETH mainnet USDC address
+
+    // modify usdc's storage to give rich account large amount of tokens
+    const index = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256"],
+        [account, balances_index] // key, slot
+    );
+
+    await await ethers.provider.send(
+        "hardhat_setStorageAt",
+        [
+            USDC_ADDRESS,
+            index,
+            ethers.utils.hexlify(ethers.utils.zeroPad(balance.toHexString(), 32)).toString()
+        ]
+    );
+}
+
+module.exports = {
+    setUSDCBalance,
+};