DO NOT COPY AND PASTE THE ANSWER THAT CHEGG HAS FOR THIS QUESTION. I HAVE ASKED THIS QUESTION TWICE, AND BOTH TIMES THE "EXPERT" COPIED AND PASTED THE ANSWER FROM CHEGG. PLEASE ACTUALLY SOLVE THIS PROBLEM, OR I'LL JUST HAVE TO CANCEL MY BARTLEBY SUBSCRIPTION.C++ Question Hello, Please create the correct code for the attached picture. Please create the code based on the given requirements. Please make sure it is working, but please DON'T use the FLAG VARIABLE or any advanced functions. Thank you! You are writing an inventory system for a library. This program will allow the user to enter a book title, remove a booktitle, and view all book titles. The book titles will be stored in a vector of strings which should be defined in your mainfunction.• In a continuous loop, give the user to the option to add a book, remove a book, view books, and quit.• If the user chooses to add a book, call a function named addBook which asks the user to enter a title and thenadds that title to the vector of strings. After asking the user to enter a title, perform the following inputvalidation on it:- 1. The first character should not be lowercase· 2. There should be no special characters in the title (i.e. Each character must be a letter, digit, or whitespacecharacter).Ask the user to enter a title until they enter a string which passes input validation.• Once the user enters a valid string:• If the string already exists in the vector, tell the user that and do nothing.- If the string is not already in the vector, add it.• If the user chooses to view books, call a function named viewBooks which prints every string in the booksvector.• If the user chooses to remove a book, call a function named removeBook. In this function, ask the user to enter atitle. If the title exists in the vector, remove it. If the title does not exist in the vector, tell the user that. Hint: Youmay want to refer to lecture 15's notes about how to remove an element from a specific index in a vector.

#include<iostream> #include<vector> #include<fstream> using namespace std; //addBook function adds book to vector which is passed as refference void addBook(vector<string> &v){ //taking input title while(true){ cout<<"Enter Title of the book:"<<endl; string title; while(!title.size())//getline function takes everything till it reaches new line character // \n if user and in second go it takes only \n ignores what user has pressed //to overcome that problem run loop till latest user enters some input getline(cin,title); //validity testing bool isvalid=true; //if first letter is lowercase make it invalid input if(title[0]>='a'&&title[0]<='z'){ isvalid=false; } if(isvalid){// if first letter is valid then check for rest of the letters for(int i=1;i<title.size();i++) { if(!(title[i]>='A'&& title[i]<='Z'||title[i]==' '||title[i]>='a'&&title[i]<='z'||title[i]>='0'&&title[i]<='9')) { isvalid=false; break; } } } if(isvalid){ v.push_back(title); break; } else cout<<"Invalid Title try again"<<endl; } } void removeBook(vector<string> &v){ cout<<"Enter the title of the book to remove:"<<endl; string title; while(!title.size())//getline function takes everything till it reaches new line character // \n if user and in second go it takes only \n ignores what user has pressed //to overcome that problem run loop till latest user enters some input getline(cin,title); for(int i=0;i<v.size();i++){ if(v[i]==title)//if found the title then remove it and return { v.erase(v.begin()+i); return; } } //if program reachs here that means program dint find such title //say it to user cout<<"No such book present"<<endl; return; } //prints book titles in each line with numbers void veiwBooks(vector<string> &v){ cout<<"Available Books:"<<endl; for(int i=0;i<v.size();i++){ cout<<i+1<<"."<<v[i]<<endl; } } //called before exiting and it adds all the vector elements to file by replacing it void addToFile(string path,vector<string> &v){ ofstream file; file.open(path);//opens files in out mode if(file.is_open()){ for(int i=0;i<v.size();i++) file<<v[i]<<endl; } else{ cout<<"Failed to open file"<<endl; } } int main(){ //vector to store titles vector<string> v; //Change the path and enter your file name if file exists in same location //of cpp file or enter the complete path of the file here. string path="file.txt"; //declearing fstream for both input ifstream file; //opening file in ios::in mode by default file.open(path); if(file.is_open()){// this block functions if file was successfully opened string temp;// helps to store single title from file while(getline(file,temp))//gets a line and stores in temp until it reaches EOF i.e end of file { //adding title to vector v.push_back(temp); } int choice;//stores user choice bool loop=true; while(loop){ cout<<"---------------------Menu-----------------"<<endl; cout<<"1.Add a book"<<endl; cout<<"2.Remove a book"<<endl; cout<<"3.Veiw books"<<endl; cout<<"4.exit"<<endl; //try block will save from crashing if user enter any invalid input try{ cin>>choice; switch(choice){ case 1: addBook(v); break; case 2: removeBook(v); break; case 3: veiwBooks(v); break; case 4: file.close(); addToFile(path,v); loop=false; break; default: cout<<"Invalid input"<<endl; } } catch(exception e){ cout<<"Invalid input:"<<endl; } } } // if file doesnot exits it creates new file and call main again else{ cout<<"Creating file"<<endl; addToFile(path,v); main(); } }Output: Before After