What is the C program for byte stuffing with the output?

Linux

//Sender

#include<string.h>

#include<stdio.h>

#include<unistd.h>

#include<fcntl.h>

#define SIZE 40

struct frame

{

char str[SIZE+1];

char tmp[2*SIZE];

char flag;

char e;

char final[2*SIZE];

}s;

main()

{int fd,len1;

int i,j,len;

fd=open("b1",O_WRONLY);

printf("\nEnter flag character and escape character for byte-stuffing:");

scanf("%c %c",& s.flag,&s.e);

printf("\nEnter string:");

scanf("%s",s.str);

len=strlen(s.str);

for(i=0,j=0;i<len;i++,j++)

{

if(s.str[i]==s.flag)

{

s.tmp[j]=s.e;

s.tmp[j+1]=s.flag;

j++;

continue;

}

else if(s.str[i]==s.e)

{

s.tmp[j]=s.e;

s.tmp[j+1]=s.e;

j++;

continue;

}

else

{

s.tmp[j]=s.str[i];

}

}

printf("\nAppended string is==>%s \n",s.tmp);

len1=strlen(s.tmp);

for(i=0,j=0;i<=len1;i++,j++)

{

if((i==0)(i==len1))

{

s.final[j]=s.flag;

s.final[j+1]=s.tmp[i];

j++;

continue;

}

else

{

s.final[j]=s.tmp[i];

}

}

printf("\nFianal string is==>%s\n",s.final);

write(fd,&s,sizeof(s));

}

//Reciver

#include<string.h>

#include<stdio.h>

#include<unistd.h>

#include<fcntl.h>

#define SIZE 40

struct frame

{

char str[SIZE+1];

char tmp[2*SIZE];

char flag;

char e;

char final[2*SIZE];

}r;

main()

{

int fd,len1;

int i,j,len;

mknod("b1",010666,0);

fd=open("b1",O_RDONLY);

read(fd,&r,sizeof(r));

printf("\nFlag character is==>%c\n",r.flag);

printf("\nEscape character is ==>%c\n",r.e);

printf("\nAnd actual message was ==>%s\n",r.str);

printf("\nReceived message is %s\n\n",r.final);

}

/*

[mca222@rccLinux mca222]$ cc -os byte_s.c

[mca222@rccLinux mca222]$ cc -or byte_r.c

[mca222@rccLinux mca222]$ ./r&

[1] 1570

[mca222@rccLinux mca222]$ ./s

Enter flag character and escape character for byte-stuffing:#

@

Enter string:sim#andh@ar

Sending message is==>#sim@#andh@@ar#

Flag character is==>#

Escape character is ==>@

And actual message was ==>sim#andh@ar

Received message is #sim@#andh@@ar#