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Casino.sol

pragma solidity ^0.4.10;

contract Ownable {
  address owner;
  function Ownable() public {
    owner = msg.sender;
  }

  modifier Owned {
    require(msg.sender == owner);
    _;
  }
}

contract Mortal is Ownable {
  function kill() public Owned {
    selfdestruct(owner);
  }
}

contract Casino is Mortal{
  uint minBet;
  uint houseEdge; //in %

  event Won(bool _status, uint _amount);

  function Casino(uint _minBet, uint _houseEdge) payable public {
    require(_minBet > 0);
    require(_houseEdge <= 100);
    minBet = _minBet;
    houseEdge = _houseEdge;
  }
  
  function() public { //fallback
    revert();
  }

  function bet(uint _number) payable public {
    require(_number > 0 && _number <= 10);
    require(msg.value >= minBet);
    uint winningNumber = block.number % 10 + 1;
    if (_number == winningNumber) {
      uint amountWon = msg.value * (100 - houseEdge)/10;
      if(!msg.sender.send(amountWon)) revert();
      emit Won(true, amountWon);
    } else {
      emit Won(false, 0);
    }
  }
  
  function checkContractBalance() Owned public view returns(uint) {
      address _contract = this;
      return _contract.balance;
  }
}

here is another update

pragma solidity 0.8.7;

contract Ownable {
    address owner;

    constructor() {
        //Set owner to who creates the contract
        owner = msg.sender;
    }

    //Access modifier
    modifier Owned() {
        require(msg.sender == owner);
        _;
    }
}

contract Mortal is Ownable {
    //Our access modifier is present, only the contract creator can      use this function
    function kill() public Owned {
        selfdestruct(payable(owner));
    }
}

contract Casino is Mortal {
    uint256 minBet;
    uint256 houseEdge; //in %

    event Won(bool _status, uint256 _amount);

    constructor (uint256 _minBet, uint256 _houseEdge) payable {
        require(_minBet > 0);
        require(_houseEdge <= 100);
        minBet = _minBet;
        houseEdge = _houseEdge;
    }


    function bet(uint256 _number) public payable {
        require(_number > 0 && _number <= 10, "Bet must be between 1 and 10");
        require(msg.value >= minBet, "Bet must be bigger than minimum Bet");
        uint256 winningNumber = (block.number % 10) + 1;
        if (_number == winningNumber) {
            uint256 amountWon = (msg.value * (100 - houseEdge)) / 10;
            if (!payable(msg.sender).send(amountWon)) revert();
            emit Won(true, amountWon);
        } else {
            emit Won(false, 0);
        }
    }

    function checkContractBalance() public view Owned returns (uint256) {
        return address(this).balance;
    }

    function checkMinBet() public view Owned returns (uint256) {
        return minBet;
    }


    fallback() external payable {
        //fallback
        revert();
    }

    receive() external payable {
        revert();
    }
}