HTMLify

#include <stdio.h>
#include<conio.h>
#include<windows.h>
#include <stdlib.h>

char square[10] = {'0','1','2','3','4','5','6','7','8','9'};
int checkwin();
void drawBoard();

int main(){
  int player = 1, i , choice;
  char mark;
  do{
    drawBoard();
    player = (player %2) ? 1: 2;
    printf("player %d,enter the choice :",player);
    scanf("%d",&choice);
    mark = (player == 1) ? 'x' : 'o';
    if(choice== 1 && square[1] == '1')
        square[1] = mark;
    else if(choice == 2 && square[2]== '2')
        square[2] = mark;
        else if(choice == 3 && square[3]== '3')
        square[3] = mark;
        else if(choice == 4 && square[4]== '4')
        square[4] = mark;
        else if(choice == 5 && square[5]== '5')
        square[5] = mark;
        else if(choice == 6 && square[6]== '6')
        square[6] = mark;
        else if(choice == 7 && square[7]== '7')
        square[7] = mark;
        else if(choice == 8 && square[8]== '8')
        square[8] = mark;
        else if(choice == 9 && square[9]== '9')
        square[9] = mark;
        else{
            printf("invalid option !");
            player--;
            getch();
        }
        i = checkwin();
        player++;
  }while(i == -1);
  drawBoard();
   if(i==1){
        printf("==>player %d won",--player);
   }
   else{
      printf("==>Game draw");
   }
      getch();
      return 0;
}
int checkwin(){
   if(square[1] == square[2] && square[2] == square[3])
    return 1;
    else if(square[4] == square[5] && square[5] == square[6])
        return 1;
    else if(square[7] == square[8] && square[8] == square[9])
        return 1;
    else if(square[1] == square[4] && square[4] == square[7])
        return 1;
    else if(square[2] == square[5] && square[5] == square[8])
        return 1;
    else if(square[3] == square[6] && square[6] == square[9])
        return 1;
    else if(square[1] == square[5] && square[5] == square[9])
        return 1;
    else if(square[3] == square[5] && square[5] == square[7])
        return 1;
    else if(square[1] != '1' && square[2] != '2' && square[3] != '3' && square[4] != '4' && square[5] != '5' && square[6] != '6' && square[7] != '7' && square[8] != '8' && square[9] != '9')
        return 0;
    else
        return -1;
}
void drawBoard(){
    system("cls");
    printf("\n\n\t tic tac toc  \n\n");
    printf("player1 (x) - player2 (0) \n\n\n");
    printf("   |   |     \n");
    printf(" %c | %c |  %c  \n",square[1],square[2],square[3]);
    printf("___|___|____\n");
    printf("   |   |    \n");
    printf(" %c | %c |  %c  \n",square[4],square[5],square[6]);
    printf("___|___|____\n");
    printf("   |   |    \n");
    printf(" %c | %c |  %c  \n",square[7],square[8],square[9]);
    printf("   |   |     \n");

}