Library Server

#include<bits/stdc++.h>
#include<string.h>
using namespace std;

/****************Coding Starts from here****************/

typedef struct book{
    string title, author, genre;
    int ISBN, avail;
    struct book *next;
}book;

typedef struct user{
    string name, contact;
    int id;
    struct user *next;
}user;

book *frnt = NULL, *rear = NULL;

void add(int ISBN, string title, string author, string genre){
    book *node = (book *)malloc(sizeof(book));
    if(node!=NULL){
        node->title.assign(title);
        node->author.assign(author);
        node->genre.assign(genre);
        node->ISBN = ISBN;
        node->next = NULL;

        book *p = frnt;
        while(p!=NULL){
            if(p->ISBN==node->ISBN){
                p->avail += 1;
                cout<<"Book added successfully"<<endl;
               return;
            }
            p = p->next;
        }
        node->avail = 1;
        if(frnt==NULL && rear==NULL){
            rear = node;
            frnt = node;
        }
        else{
            rear->next = node;
            rear = node;
        }
        cout<<"Book added successfully"<<endl;
    }
}

void remov(int ISBN){
    book *temp;
    book *p = frnt;
    if(frnt->ISBN==ISBN){
        temp = frnt;
        frnt=frnt->next;
        free(temp);
        if(frnt==NULL){
            rear = NULL;
        }
        cout<<"Book Removed of ISBN: "<<ISBN<<endl;
        return;
    }
    while(p!=NULL){
        if(p->next->ISBN == ISBN){
            temp = p->next;
            p->next = p->next->next;
            free(temp);
            cout<<"Book Removed of ISBN: "<<ISBN<<endl;
            return;
        }
        p = p->next;
    }
    cout<<"Book "<<ISBN<<" Not Found"<<endl;
}



void print(){
    book *p = frnt;
    while(p!=NULL){
        cout<<"ISBN: "<<p->ISBN<<endl;
        cout<<"\tTitle: "<<p->title<<endl;
        cout<<"\tAuthor: "<<p->author<<endl;
        cout<<"\tGenre: "<<p->genre<<endl;
        cout<<"\tAvailable: "<<p->avail<<" Copies"<<endl;

        p = p->next;
    }
}

void solution(){
    add(101, "English", "Amir", "Academic");
    add(102, "Bangla", "Soikot", "Academic");
    add(103, "Math", "Moushi", "Academic");
    add(105, "Biology", "Shovon", "Academic");
    add(101, "English", "Amir", "Academic");
    print();

    remov(106);
    


}

int main(){


	//test
		solution();
	return 0;
}