Solidity Challenge

You are asked to write smart contracts for an ETH staking app.
User can stake their ETH in a vault (Constant APR 10%)
User gets rewarded in devUSDC (an ERC20 token you will create as well)
Assume that devUSDC is always worth $1
When a user stakes ETH: all of that ETH will be put as collateral in Compound (v2).
When a user wants to Withdraw their ETH. The vault will take out the ETH the user staked (without the yields) from Compound and will give it back to the user with the devUSDC rewards
Minimum amount to stake is 5 ETH
To get the price of ETH you will need to use a price oracle from chainlink

Submission - should be in the form of:

Github repo with the contract code
Typescript Tests using Hardhat with at least two users simultaneously staking/unstaking funds.
Deployed contracts to Goerli Testnet.
Verified contracts on etherscan.

npx hardhat run scripts/deploy.ts --network goerli

DevUSDC deployed to: 0x50d7ddbeb73d962a40dd0160f38d27fd93bc6843

Staking deployed to: 0x62927BD311f9173d322416d798168D7a0985f9f4