Try running some of the following tasks:

npx hardhat help
npx hardhat test
REPORT_GAS=true npx hardhat test
npx hardhat node
npx hardhat run scripts/deploy.ts

This is a Ethereum staking contract allowing users to stake their tokens for a specified duration and earn interest. The contract uses variable interest rates depending on the staking duration.

• Allows users to stake their tokens for a specified duration.
• Offers variable interest rates depending on the staking duration.
• Allows users to unstake their tokens after the stake has expired.
• Enables users to withdraw their earnings.
• Allows the contract owner to disable/enable the contract.
• Enables the contract owner to set the interest rate for a specified duration.
• Provides a function to process expired stakes and add earnings to users' accounts.

Users can stake their tokens by calling the stake(uint256 durationIndex) function with the index of the desired staking duration. The available staking durations are 30 days, 60 days, and 90 days.

After a stake has expired, users can unstake their tokens by calling the unstake(uint256 stakeId) function with the ID of the stake they want to unstake.

Users can withdraw their earnings by calling the withdrawEarnings() function.

The contract owner can disable the contract by calling the disable() function and enable it by calling the enable() function.

The contract owner can set the interest rate for a specified duration by calling the setInterestRate(uint256 durationIndex, uint256 interestRate) function.

The contract owner can process expired stakes and add earnings to users' accounts by calling the getExpiredStakes() function.

Users can view their stakes by calling the getStakes(address user) function with their Ethereum address as the parameter.

The contract includes modifiers to ensure that only the contract owner can call specific functions and that the contract is enabled before allowing users to interact with it.