todo_template.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.3;

contract ToDo {
    
    event TaskCreated(uint256 id, uint256 date, string content, bool done);

    event TaskCompleted(uint256 id, uint256 dateComplete);

    event TaskDeleted(uint256 id);
    
    struct Task {
        uint256 id;
        uint256 date;
        string content;
        bool done;
        uint256 dateComplete;
    }
    
    //creates new task, returns task id
    function createTask(string memory _content) public returns(uint256) {
    }

    //return array of task ids for all existing, non deleted tasks
    function getTaskIds() external view returns (uint256[] memory) {
    }
    
    //Returns task with given id, empty task or revert if task not found
    function getTask(uint256 id) external view returns(Task memory) {
    }

    //not required, bonus task
    function getTasks() external view returns (Task[] memory) {
    }

    //marks task as done
    function completeTask(uint256 id) external taskExists(id) {
    }
    
    //deletes task with given id, reverts if task doesn't exist
    function deleteTask(uint256 id) external taskExists(id) {
    }

    // reverts if task with this id doesn't exist
    modifier taskExists(uint256 id) {
        _;
    }
    
}