A example Staking Function

Crypto-BEP20-Stakeable-Stake

    /**
    * @notice
    * _Stake is used to make a stake for an sender. It will remove the amount staked from the stakers account and place those tokens inside a stake container
    * StakeID 
    */
    function _stake(uint256 _amount) internal{
        // Simple check so that user does not stake 0 
        require(_amount > 0, "Cannot stake nothing");
        

        // Mappings in solidity creates all values, but empty, so we can just check the address
        uint256 index = stakes[msg.sender];
        // block.timestamp = timestamp of the current block in seconds since the epoch
        uint256 timestamp = block.timestamp;
        // See if the staker already has a staked index or if its the first time
        if(index == 0){
            // This stakeholder stakes for the first time
            // We need to add him to the stakeHolders and also map it into the Index of the stakes
            // The index returned will be the index of the stakeholder in the stakeholders array
            index = _addStakeholder(msg.sender);
        }

        // Use the index to push a new Stake
        // push a newly created Stake with the current block timestamp.
        stakeholders[index].address_stakes.push(Stake(msg.sender, _amount, timestamp));
        // Emit an event that the stake has occured
        emit Staked(msg.sender, _amount, index,timestamp);
    }