Create tictactoe.sol

tictactoe.sol

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+pragma solidity ^0.5.10;
+
+// based on the skeleton file TicTacToe.sol by
+// https://github.com/spidfire
+
+contract TicTacToe {
+  uint[] board = new uint[](9);
+  address player1;
+  address player2;
+  uint whoseTurn = 1;
+  bool full = false;
+
+  constructor() public{
+    player1 = msg.sender;
+  }
+
+  function joinGame() public {
+    require(!full);
+    player2 = msg.sender;
+    full = true;
+  }
+
+  function doMove(uint _place) public returns (uint){
+
+    uint winner = checkWinner();
+    if(winner == 1){
+      return 1;
+    }
+    if (winner == 2){
+      return 1;
+    }
+    // correct users is on turn
+    if(whoseTurn == 1){
+      if(msg.sender != player1) return 2;
+    }else if(whoseTurn == 2){
+      if(msg.sender != player2) return 2;
+    }
+
+    // is on the board
+    if(_place < 0 || _place >= 9) return 3;
+
+    // Is not already set
+    if(board[_place] != 0) return 4;
+
+    board[_place] = whoseTurn;
+    whoseTurn = 3 - whoseTurn;
+
+    return 0;
+  }
+
+
+
+  uint[][]  tests = [[0,1,2],[3,4,5],[6,7,8], [0,3,6],[1,4,7],[2,5,8], [0,4,8],[2,4,6]  ];
+  // 0 1 2
+  // 3 4 5
+  // 6 7 8
+  function checkWinner() public view returns (uint){
+    for(uint i =0; i < 8;i++){
+      uint[] memory b = tests[i];
+      if(board[b[0]] != 0 && board[b[0]] == board[b[1]] && board[b[0]] == board[b[2]]) return board[b[0]];
+    }
+
+    return 0;
+  }
+
+  function currentState() public view returns(string memory, string memory) {
+    string memory text = "No winner yet";
+    uint winner = checkWinner();
+    if(winner == 1){
+      text = "Winner is X";
+    }
+    if (winner == 2){
+      text = "Winner is O";
+    }
+
+    bytes memory out = new bytes(11);
+    byte[] memory signs = new byte[](3);
+    signs[0] = "-";
+    signs[1] = "X";
+    signs[2] = "O";
+    bytes(out)[3] = "\n";
+    bytes(out)[7] = "\n";
+
+    for(uint i =0; i < 9;i++){
+      bytes(out)[i + i/3] = signs[board[i]];
+
+    }
+
+    return (text, string(out));
+  }
+
+}