C Program
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main() {
int i, j,count=0,nl;
char str[100];
clrscr();
printf("enter the bit string: ");
gets(str);
for (i=0;i<strlen(str);i++) {
count=0;
//the following code search the six ones in given string
for (j=i;j<=(i+5);j++) {
if(str[j]=='1') {
count++;
}
}
//if there is six ones then folling code execute to bit stuffing after five ones
if(count==6) {
nl=strlen(str)+2;
for (;nl>=(i+5);nl--) {
str[nl]=str[nl-1];
}
str[i+5]='0';
i=i+7;
}
}
puts(str);
getch();
}