Algorithm:

1. Start
2. Take the String from the user.
3. Create index, set index = 0 (Start position of string)
4. Create length Counter set lc = 1 (length of Substring)
5. While index < length of Password
	6. While (lc+index) < length of Password
		7. check if consequtive substrings of length lc are equal.
		8. If yes print REJECTED and return from main. (exit)
		9. Else, increment lc
10. Increment index
11. Print ACCEPTED  (loops are done, the string is fine because it was not rejected)
12. Exit

Program:

#include<stdio.h>
#include<conio.h>
#include<string.h>
char temp[10];
const char *substr(int i,int j,char *pass)
{
	int k=0;
	temp[0] = '\0';
	while(k<j)
	{
	 temp[k] = pass[i];
	 i++;
	 k++;
	}
	temp[k] = '\0';
	return(temp);
}
void main()
{
	int index,lc,plen;
	char password[10],temp_pass1[10],temp_pass2[10];
	printf("\n Enter Your Password: ");
	scanf("%s",password);
	plen = strlen(password);
	for(index = 0;index<plen; index++)
	{
		for(lc = 1;(lc+index)<plen;lc++)
		{
			strcpy(temp_pass1,substr(index,lc,password));
			strcpy(temp_pass2,substr(index+lc,lc,password));

			if(strcmp(temp_pass1,temp_pass2) == 0)
			{
				printf("\n Rejected: %s %s",temp_pass1,temp_pass2);
				getch();
				return;
			}else
				continue;
		}
	}
	printf("\n Accepted");
	getch();
}