Hola grupo tengo un problema realizando la practica de modulos de learnyounode

Notes

Me pide realizar dos archivos uno llamado program.js y otro mymodulo,js para exportar una funcion y asi hago los codigos

// modulo

const fs = require ("fs");

const path = require("path");

function solucion () {
let encontrar = fs.readdir(process.argv[2] , (err,files) => {

if(err){

console.error(err);

}else {

  const txtFiles = files.filter(file => file.endsWith('.md'));

    txtFiles.forEach(file => {
    console.log(file);
  });

    }

});
  }
   module.exports = {solucion};

// principal que es program.js const fs = require('fs');

const path = require("path");

const recibe = require ("./mymodule");

console.log(recibe.solucion());

// la respuesta que me da esta en la imagen. espero que me ayuden, saludos.

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