C#

• Read a text file

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/file-system/how-to-read-a-text-file-one-line-at-a-time

• convert a string to numbers

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/types/how-to-convert-a-string-to-a-number

• Split a string by a specified delimiter:

https://www.completecsharptutorial.com/csharp-articles/csharp-string-function.php

2. string[] split = firstname.Split(new char[] { 'e' });
3.