How to use .dll libs created by rust

help
7

my basic purpose for doing this is to break my c program , certain reasons

#1 file reading file via functions like fscanf(); is lot faster than rust and lot simpler because given the structure of file directly picking up numbers as integers is possible as file is refined
#2 that dll failed in all languages "ffi" functionality i tried , namely ruby, python , C#

# here is the python code :

from ctypes import cdll
lib = cdll.LoadLibrary("C:/Users/Dell/Desktop/hack/embed.dll")

lib.test.hello()

pass

here is the python error

C:\Users\Dell\Desktop\rust\testlib>C:\Users\Dell\Desktop\hack\sam.py
Traceback (most recent call last):
  File "C:\Users\Dell\Desktop\hack\sam.py", line 12, in <module>
lib.test.hello()
  File "C:\Users\Dell\AppData\Local\Programs\Python\Python37\lib\ctypes\__init__.py", line 369, in __getattr__
func = self.__getitem__(name)
  File "C:\Users\Dell\AppData\Local\Programs\Python\Python37\lib\ctypes\__init__.py", line 374, in __getitem__
func = self._FuncPtr((name_or_ordinal, self))
AttributeError: function 'test' not found

here is C# code

using System;
using System.Runtime.InteropServices;

namespace hello_c_sharp
{
class Program
{
    [DllImport("C:/Users/Dell/Desktop/rust/testlib/target/release/embed.dll")]
    public static extern void Hello();
    static void Main(string[] args)
    {
       
        Hello();
        Console.ReadLine();

      //  System("pause");
    }
}
}

here is the C# error

Exception thrown: 'System.EntryPointNotFoundException' in hello_c_sharp.dll
An unhandled exception of type 'System.EntryPointNotFoundException' occurred in 
hello_c_sharp.dll
Unable to find an entry point named 'Hello' in DLL 
'C:/Users/Dell/Desktop/rust/testlib/target/release/embed.dll'.