Robo dialy activities Problem

Robo dialy activities first eat ,then computer and then sleep (ecs)

The day starts with eat he can do eat/computer/sleep

if the day starts with  computer he can do computer/sleep

The day starts with sleep he can do onlysleep

I/p

Ex:    ecs                             o/p   Success

Ex:    ces                             o/p Fail

Ex:     eeccsss                     o/p success

#include<stdio.h>

#include<string.h>

#include<conio.h>

char pat[]="ecs";

int prev=0,curr=0;

int check(char ch1,char ch2)

{

int i;

for(i=0;pat[i]!=0;i++)

if(pat[i]==ch1)

curr=i;

for(i=0;pat[i]!=0;i++)

if(pat[i]==ch2)

prev=i;

if(curr<prev)

return 0;

else

return 1;

}

void main()

{

 /* ces  cceess */

 char str[]="ssss";

 int i=1;

  clrscr();

 while(str[i]!=0)

 {

 if(check(str[i],str[i-1]))

 {

 i++;

 }

 else

 break;

 }

 if(i==strlen(str))

printf("\n....Success",i);

else

printf("\nFail",i);

}