# Repay Exercise In this exercise, you'll learn how to repay tokens to Aave V3. The starter code for this exercise is provided in `foundry/src/exercises/Repay.sol` Solution is provided in `foundry/src/solutions/Repay.sol` ## Task 1 - Repay all the debt owed to Aave V3 ```solidity function repay(address token) public returns (uint256) { // Task 1.1 // msg.sender will pay for the interest on borrow. // Transfer the difference (debt - balance in this contract) // Task 1.2 - Approve the pool contract to transfer debt from this contract // Task 1.3 - Repay all the debt to Aave V3 // All the debt can be repaid by setting the amount to repay to a number // greater than or equal to the current debt // Task 1.4 - Return the amount that was repaid } ``` Implement the `repay` function to repay `token` to Aave. - `token` is the token to repay - Pay all of debt that this contract owes to Aave > Hint - Call `pool.repay` ## Test ```shell forge test --fork-url $FORK_URL --fork-block-number $FORK_BLOCK_NUM --match-path test/Repay.test.sol -vvv ```