Hi! I writing book shop managment code for my school project in c++

I need help to writing int sale_book() function in **C++**

This function should open "Book_adventure.txt" and get the information of the books(sale price,stock info) as seen in the output

After get stock and sale info it should get the sales amount from user and return money(int) where it is called

After sale it should change stock information in "Book_adventure.txt" If stock is over, delete the whole line which containing information about the book

In "Book_adventure.txt" each line has information about 1 book

as example:

1.Line: Bookname:book1*Authorname:autorhor1*Genre:adventure*Purchaseprice:9+Saleprice:10&Stockinformation:50! (I use speacial signs while writing to file to distinguish strings)

*Book_adventure - Not Defteri Dosya Dzen Biim Grnm Yardm book1*author1*adventure*9+10&50! book2*author2*adventure 15+17810! St 1, Stn 33 100% Windows (CRLF) UTF-8 EMPLOYEE PAGE- 1. Show Books 2.Sell Books 3. Exit 2 Enter the book name : book1 Enter the book genre : adventure Bookname : Booki sale price : 10 Stock: 50 Enter the number of sales: 5 Books successfully sold! r *Book_adventure - Not Defteri Dosya Dzen Biim Grnm Yardm book1*author1*adventure*9+10&45! book2*author2*adventure*15+17&10! St 1, Stn 33 100% Windows (CRLF) UTF-8