Creating a staking smart contract where users can stake tokens and earn rewards involves several steps. We are use of ERC-20 tokens for staking and rewards.
Interfaces: The IERC20 interface is used to interact with ERC-20 tokens for staking and rewards.
Staking Logic:
stake(uint256 _amount): Users can stake a specified amount of tokens.
withdraw(uint256 _amount): Users can withdraw their staked tokens.
exit(): Users can withdraw all their staked tokens and claim their rewards.
Reward Logic:
rewardPerToken(): Calculates the reward per token based on the time since the last update.
earned(address account): Calculates the total rewards earned by a user.
getReward(): Allows users to claim their earned rewards.
Modifiers:
updateReward(address account): Updates the reward calculation for a user.
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