The previous code has been given by the instructions, but I can't figure out how to do these.. Please help

// used to create a linked list of containers, each contaning a "book"

struct container {

struct book *book;

struct container *next;

} *list = NULL;

// used to hold book information and linked list of "frequently bought together (fbt)"

struct book {

char title[30];

char author[30];

float price;

struct fbt *fbts;

};

// used to create a linked list of frequently bought together (fbt)

struct fbt {

struct book *book;

struct fbt *next;

};

// forward declaration of functions that have already been implemented

void flush();

void branching(char);

void registration(char);

// the following forward declarations are for functions that require implementation

// HW07

// Total: 50 points for hw07

// return type // name and parameters // points

void add_book(char*, char*, float); // 15

struct book* search_book(char*); // 10

void remove_book(char*); // 15

void print_all_books(); // 10

// HW08

// Total: 50 points for hw08

struct container * buy_book(); // 15

struct container * setfbt(struct container *); // 25

void display_fbt(struct container*); // 10

int main()

{

char ch = 'i';

printf("Book Information ");

do

{

printf("Please enter your selection: ");

printf("\ta: add a new book to the list ");

printf("\ts: search for a book on the list ");

printf("\tr: remove a book from the list ");

printf("\tl: print the list of all books ");

printf("\tb: buy a book ");

printf("\tq: quit ");

ch = tolower(getchar());

flush();

branching(ch);

} while (ch != 'q');

return 0;

}

// consume leftover ' ' characters

void flush()

{

int c;

do c = getchar(); while (c != ' ' && c != EOF);

}

// branch to different tasks

void branching(char c)

{

switch (c)

{

case 'a':

case 's':

case 'r':

case 'l':registration(c); break;

case 'b': {

struct container * buy = buy_book();

buy = setfbt(buy);

display_fbt(buy);

break;

}

case 'q': break;

default: printf("Invalid input! ");

}

}

//

// This function will determine what info is needed and which function to send that info to.

// It uses values that are returned from some functions to produce the correct ouput.

// There is no implementation needed here, but you should trace the code and know how it works.

// It is always helpful to understand how the code works before implementing new features.

// Do not change anything in this function or you risk failing the automated test cases.

void registration(char c)

{

if (c == 'a')

{

char input[100];

printf(" Please enter the book's info in the following format: ");

printf("title:author:price ");

fgets(input, sizeof(input), stdin);

// discard ' ' chars attached to input

input[strlen(input) - 1] = '\0';

char* title = strtok(input, ":"); // strtok used to parse string

char * author = strtok(NULL, ":");

float price = atof(strtok(NULL, ":"));

struct book* result = search_book(title);

if (result == NULL)

{

add_book(title, author, price);

printf(" Book added to list successfully ");

}

else

printf(" That book is already on the list ");

}

else if (c == 's' || c == 'r')

{

char title[30];

printf(" Please enter the book's title: ");

fgets(title, sizeof(title), stdin);

// discard ' ' chars attached to input

title[strlen(title) - 1] = '\0';

struct book* result = search_book(title);

if (result == NULL)

printf(" That book is not on the list ");

else if (c == 's') {

printf(" Title: %s ", result->title);

printf("Author: %s ", result->author);

printf("Price: %.2f ", result->price);

}

else

{

remove_book(title);

printf(" Book removed from the list ");

}

}

else

{

print_all_books();

}

}

]

// hwe7 Q3: remove_one (15) // In this function, you are passed the title of a book to remove the corresponding book from the list. // The search function is called before this function so you can assume that the book is on the list. // You will need to find the book and remove it using proper memory management to ensure no memory leaks void remove_book(char* title) // hwe7 Q4: print_all_books (10) / In this function, you should print the list of available books in the list //If there is no book in the list, you should print "There are no books on this list!" void print all_books ()