Find Repeated Strings of Given Length ( C Program )

/*given the length it should print all the repeated strings in the word of that particular length*/

#include<stdio.h>
#include<conio.h>
int main()
{
 int i,j,k,l,p=0,f,q=0,t;
 char s[100];
 printf("\nenter the word:");
 gets(s);
 textcolor(YELLOW);
 cprintf("\nenter the length of the string to be repeated twice:");
 scanf("%d",&f);
 textcolor(GREEN);
 cprintf("\nThe strings which are repeated are:");
 printf("\n");
 for(i=f;s[i]!='\0';i++)   /*it is required to test for repetition from the value of the given length as there can be no repetition before that */
 {
   for(j=i-f;j>=q-1;j--)      /* comparision of the word must start from the current position -length given.....if matched then check for the                                        next element else  decrement j*/
   {
    for(k=i,l=j;k<i+f;k++,l++) /*compare two words till the length is equal to the given length*/
    {
     if(s[k]==s[l])
     {
      p++;
      if(p==f)
       {
	q=l;
	textcolor(1+i);
	for(t=i;t<i+f;t++)
	{
	 cprintf("%c",s[t]);
	}
	printf("\n");
       }
     }
     else
     {
      k=i;l=j;p=0;break;
     }
    }
   }
 }
 getch();
 return 0;
}