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Adoption.sol

pragma solidity ^0.4.17;

contract Adoption {
  address[16] public adopters;
  function adopt(uint petId) public returns (uint) {
    require(petId >= 0 && petId <= 15);

    adopters[petId] = msg.sender;

    return petId;
  }

  function getAdopters() public view returns (address[16] memory) {
    return adopters;
  }
}

Money.sol

pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
contract Money {
  struct People{
    uint id;
    string name;
    uint amount;
  }
  mapping (uint => People) public peoples;
  event votedEvent(uint indexed _candidateId);
  uint public candidateConut;

  constructor() public {
    candidateConut = 0;
    addCandidate("Holder 1");
    addCandidate("Holder 2");
  }
  function addCandidate(string memory _name) public {
    peoples[candidateConut] = People(candidateConut,_name,0);
    candidateConut++;
  }
  
  function addManyCandidate(string[] memory names) public {
    for(uint i = 0; i < names.length; i++) {
        addCandidate(names[i]);
    }
  }
  //return Single structure
  function get(uint _candidateId) public view returns(People memory) {
    return peoples[_candidateId];
  }
  //return Array of structure Value
  function getPeople() public view returns (uint[] memory, string[] memory,uint[] memory){
      uint[]    memory id = new uint[](candidateConut);
      string[]  memory name = new string[](candidateConut);
      uint[]    memory amount = new uint[](candidateConut);
      for (uint i = 0; i < candidateConut; i++) {
          People storage people = peoples[i];
          id[i] = people.id;
          name[i] = people.name;
          amount[i] = people.amount;
      }

      return (id, name,amount);

  }
  //return Array of structure
  function getPeoples() public view returns (People[] memory){
      People[]    memory id = new People[](candidateConut);
      for (uint i = 0; i < candidateConut; i++) {
          People storage people = peoples[i];
          id[i] = people;
      }
      return id;
  }
}

nSession.sol

pragma solidity ^0.4.17;

import "./test.sol";

contract Session {

    // Structure to hold details of Bidder}
    
    enum State {Init, Vote, Done}

    address public creator;
    address public mainContract;
    Main MainContract;

    string public name;
    string public description;
    string public image;
    uint256 public proposedPrice;
    uint256 public deviation;
    uint256 public finalPrice;

    address[] public iParticipants;
    uint256 public nParticipants;
    mapping(address => uint256) public pricings;

    State public state = State.Init;

    address public admin;

    function Session(address _mainContract, string _name, string _description, string _image) public {
        creator = msg.sender;
        admin = msg.sender;
        mainContract = _mainContract;

        MainContract = Main(_mainContract);

        name = _name;
        description = _description;
        image = _image;
        state = State.Init;

        proposedPrice = 0;
        deviation = 0;
        finalPrice = 0;
        nParticipants = 0;
    
        MainContract.addSession(address(this));
    }
    
    function startSession() public {
        
        if (state == State.Done) {
            revert();
        }
        state = State.Vote;
    }
    
    function closeSession(uint256 _finalPrice) public {
        if (state != State.Vote) {
            revert();
        }
        
        uint256 tuso = _finalPrice - proposedPrice;
        if(tuso < 0) {
            tuso = -tuso;
        }
        
        uint256 dnew = tuso*100/_finalPrice;
        finalPrice = _finalPrice;
        deviation = dnew;
        
        for(uint indexParticipant = 0; indexParticipant < nParticipants; indexParticipant ++) {
            MainContract.updateDeviation(iParticipants[indexParticipant], deviation);
            MainContract.updateNSessions(iParticipants[indexParticipant]);
        }
        
        state = State.Done;
    }
    
    function updateProduct(string _name, string _description, string _image) public {
        name = _name;
        description = _description;
        image = _image;
    }
    
    function pricing(uint256 _price) public {
        
        var (fullname, email, nSessions, currentParticipantDeviation, islogin) = MainContract.getInfoParticipant(msg.sender);
        
        if(!islogin) {
            revert();
        }
        
        if(_price <= 0) {
            revert();
        }
        
        iParticipants.push(msg.sender);
        
        if(pricings[msg.sender] == 0) {
            nParticipants ++;
        }
        
        pricings[msg.sender] = _price;
        
        // caculator proposedPrice
        
        uint256 totalPrice = 0;
        uint256 totalDeviation = 0;
        
        for(uint indexParticipant = 0; indexParticipant < nParticipants; indexParticipant ++) {
            totalPrice += _price*(10000 - currentParticipantDeviation);
            totalDeviation += currentParticipantDeviation;
        }
        
        proposedPrice = totalPrice/(10000*nParticipants - totalDeviation);
    }
}

test.sol

pragma solidity ^0.4.17;

contract Main {

    // Structure to hold details of Bidder
    struct IParticipant {
        string fullname;
        string email;
        uint8  nSessions;
        uint256 deviation;
        bool islogin;
    }

    address public admin;
    address[] public iParticipants;
    uint256 public nParticipants;
    mapping(address => IParticipant) public participants;

    address[] public sessions;
    uint256 public nSessions;

    function Main() public {
        admin = msg.sender;
    }
    
    function register(string fullname, string email) public { 
        address _account = msg.sender;
        IParticipant storage currentParticipant = participants[_account];
        if (!currentParticipant.islogin) {
          nParticipants = iParticipants.push(_account);
        }
        currentParticipant.fullname = fullname;
        currentParticipant.email = email;
        currentParticipant.nSessions = 0;
        currentParticipant.islogin = true;
        currentParticipant.deviation = 50;// Default is 50%
    }

    function addSession(address session) public {
        nSessions = sessions.push(session);
    }
    
    function getInfoParticipant(address _account) public returns(string, string, uint8, uint256, bool) {
        IParticipant storage currentParticipant = participants[_account];
        return  (currentParticipant.fullname, currentParticipant.email, currentParticipant.nSessions, currentParticipant.deviation, currentParticipant.islogin);
    }
    
    function updateDeviation(address _account, uint256 deviationNew) public {
        IParticipant storage currentParticipant = participants[_account];
        uint256 deviation = ((currentParticipant.deviation*currentParticipant.nSessions) + deviationNew)/(currentParticipant.nSessions + 1);
        currentParticipant.deviation = deviation;
    }
    
    function updateNSessions(address _account) public {
         IParticipant storage currentParticipant = participants[_account];
         currentParticipant.nSessions = currentParticipant.nSessions + 1;
    }

}