ปัญหาเกมงูกินหาง

#include<stdio.h>
#include<conio.h>
#include<windows.h>
#include<time.h>
#include <stdlib.h>
void random();
void grid();
void grid2();
void check();
void delay(unsigned int mseconds);
void SetColorAndBackground(int ForgC, int BackC);
void gotoxy(int x,int y);
COORD coord={0,0};
void game();
void game2();
int x2,y2,tail=0,x=20,y=10;
char ch_rand[]="CPE";

main()
{
char ch;
int choice=1;
do
{
system("cls");
gotoxy(10,3);
if(choice==1){SetColorAndBackground(15,2);}
printf("GAME");
SetColorAndBackground(15,0);

gotoxy(10,4);
if(choice==2){SetColorAndBackground(15,2);}
printf("XO Game ");
SetColorAndBackground(15,0);

gotoxy(10,5);
if(choice==3){SetColorAndBackground(15,2);}
printf("Menu 3 ");
SetColorAndBackground(15,0);

gotoxy(10,6);
if(choice==4){SetColorAndBackground(15,2);}
printf("EXIT ");
SetColorAndBackground(15,0);

ch=getch();
switch(ch)
{
//Up
case 72: choice=choice-1; break;
//down
case 80: choice=choice+1; break;
}

if(choice>4)choice=1;
if(choice<1)choice=4;

if(ch==13)
{
switch(choice)
{
case 1: game();break;
case 2: game2();break;
//case 3:
case 4: return 0; break;
}
}
}while(ch!=27);

}
void game()
{
int c,i,right;
c=strlen(ch_rand);
system("cls");
char ch;
do
{
gotoxy(0,1);
printf("ESC to Exit");
random();
do
{
grid();
gotoxy(35,2);
printf("\t\t\tX %d Y : %d C : %d",x,y,c);
ch=getch();
gotoxy(x,y);
printf(" ");
check();

switch(ch)
{
case 72:y--;break; //up
case 80:y++;break; //down
case 75:x--;break; //left
case 77:x++;break; //right
case 27:return 0;break;
}
gotoxy(x,y);
printf("*");

}while((x!=x2)||(y!=y2));
gotoxy(30+tail,2);
printf("%c",ch_rand[tail]);

if(tail==c-1)
{
system("cls");
printf("FINISH! ");
for(i=0;i<25;i++)
{
delay(50);
printf("*");
delay(50);
}
return 0;
}
tail++;
}while(ch!=27);
}
void game2()
{
char ch;
system("cls");
do
{
grid2();

gotoxy(16,5);
gotoxy(16,6);
printf(" # #\n");
gotoxy(16,7);
printf(" # #\n");
gotoxy(16,8);
printf("# #\n");

ch=getch();

}while(ch!=27);
}

void grid2()
{
int i;
for(i=0;i<18;i++)
{
gotoxy(15,i+4);
printf("|");
gotoxy(48,i+5);
printf("|");
gotoxy(26,i+5);
printf("|");
gotoxy(37,i+5);
printf("|");
}

for(i=0;i<34;i++)
{
gotoxy(15+i,4);
printf("-");
gotoxy(15+i,22);
printf("-");
gotoxy(15+i,10);
printf("-");
gotoxy(15+i,16);
printf("-");
}
}
void grid()
{
int i;
for(i=0;i<17;i++)
{
gotoxy(5,i+4);
printf("*");
gotoxy(72,i+5);
printf("*");
}
for(i=0;i<68;i++)
{
gotoxy(5+i,4);
printf("*");
gotoxy(5+i,21);
printf("*");
}
}
void random()
{
srand (time(NULL));
x2=rand()%55+10;
y2=rand()%14+6;
gotoxy(x2,y2);
printf("%c",ch_rand[tail]);
gotoxy(30,3);
printf("POINT X: %d Y: %d",x2,y2);
}

void delay(unsigned int mseconds)
{
clock_t goal = mseconds + clock();
while (goal > clock());
}

void SetColorAndBackground(int ForgC, int BackC)
{
WORD wColor = ((BackC & 0x0F) << 4) + (ForgC & 0x0F);;
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), wColor);
return;
}
void gotoxy(int x,int y)
{
coord.X=x;
coord.Y=y;
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);
}
void check()
{

if((x<7)||(x>70))
{
if(x<7)
x=7;
else
x=70;
}
if((y>20)||(y<5))
{
if(y>20)y=20;
else
y=5;
}
}

เกม 1 นะครับ ผมมีปัญหาเกมงูกินหาง ขอแนวคิดกินตัวอักษรแล้วหางยาวนะครับ