Thread: create a book library without linked lists

Hello! I need to create a book library using dynamic memory allocation and structs.
I started the program but having a hard time finishing it.. I don't really know how should i organize the program and what's missing in order to finish it.
i need to take the commends from a simulation file. and the compiling needs to be in GCC.

the simulation file looks like this:
#lines which starts with # you shall be able to ignore in your code
#1 is the add book operation id, BOOK ID, BOOK NAME,author,pages number, publish year, category
1,A250,Adventures of Huckleberry Finn,Mark Twain,120,1884,adventure
#2 operation id, book id
2,A250
#3 operation id, book id
3,A250
#4 operation id
4
#5 operation id, file name
5, C:\bookStorage.txt
#6 operation id, file name
6, C:\bookStorage.txt

explanation about each command:
1. add a book
2. delete a book
3.search a book by it's serial number
4. print out all the books
5.save the book library in a file
6. get the book library data from a file


this is what i did so far:

Code:

typedef struct{
	int serial;
	int pg_num;
	int y_published;
	char* name;
	char* author;
	char* category;
}Book;

typedef struct(
	Book* b;
	int book_num;
	int length;
}Book_Shelf;

typedef struct{
	int command_number;
	Book b;
	char* file_name;
}Command;

void set_command(command* c, char* str);

int main(int argc, char* argv[]){

	FILE* pf;
	char buffer[512];
	Command c;
	
	pf = fopen(argv[1], "r");
	
	fgets(buffer, 512, pf);
	while (buffer[0] == '#'){
		fgets(buffer, 512, pf);
	}
	
	set_command(c, buffer);
	
	command_execute(c);
	
	return 0;
	
}

void add_book(Book_Shelf* bs, Book* b){
	
	if (bs->book_num == bs->length){
		bs->length *= 1.5;
		bs->b = (Book*)realloc(bs->b, length*sizeof(Book));
		if(bs->b==NULL)
			exit2;

	}
	
	bs->b[book_num].serial = b->serial;
	/* ... */
	
	
}

char* get_next_word(char* str, int* index){

	int i, length = 0;
	char* temp_str;
	
	for (i = 0; (str[i] != ',') && (str[i] != '\0'); i++, length++);
	length++;

	temp_str = (char*)malloc(length);
	for (i = 0; i < length; i++){
		temp_str[i] = str[i];
	}
	temp_str[length] = '\0';
	
	*index = i;
	
	return temp_str;

}

void set_command(command* c, char* str){
	
	int i = 0;
	
	c->command_number = atoi(*(get_next_word(str+i, &i)));
	
	switch(c->command_number){
		case 1:{
			c->b.serial = get_next_word(str+i, &i);
			c->b.name = get_next_word(str+i, &i);
			c->b.author = get_next_word(str+i, &i);

		}
	}
}