changing files extensions from txt to vim included in a directory

txtToVim.js

const fs =  require('fs')

const txtFetcherInDir =  (dirname, callback)=>{
  fs.readdir(dirname, (err, files) => {
    if (err) throw err;
    const endWithtxt= files.filter((file)=>{
      const lastDot = file.lastIndexOf('.') + 1
      return file.substring(lastDot) === 'txt'
    })
    callback(endWithtxt)
  });
}

const txtCutter = (text)=>{return text.substring(0, text.lastIndexOf('.'))}

txtFetcherInDir('.', (txtFiles)=> {
  if(txtFiles.length ==  0) return console.log("There are no files end with txt in this directory")
  txtFiles.forEach((txtFormat)=>{
    const vimFormat = txtCutter(txtFormat)
    fs.rename(txtFormat,vimFormat,(err)=>{
      if (err) throw err;
      console.log(vimFormat)
    })  
  })
})