diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..fbeebd3
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,7 @@
+const presets = [
+	[
+		"@babel/preset-env",
+	]
+];
+
+module.exports = { presets };
\ No newline at end of file
diff --git a/finder.mjs b/finder.mjs
index 68fe9c6..5ed233a 100644
--- a/finder.mjs
+++ b/finder.mjs
@@ -4,7 +4,8 @@
 import { tagSectionSeparator, tagSeparator } from './configs.mjs'
 import exifr from 'exifr'
 import moment from 'moment'
-import path from 'path'
+import log from 'log_level'
+
 
 /**
  * finds patterns for file name
@@ -25,8 +26,8 @@ export default class finder {
 	}
 
 	static findFormattedDate (filepath) {
-		let match = filepath.match(/\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/ig)
-		// console.log('match findFormattedDate', match)
+		let match = filepath.match(/\d{4}-\d{2}-\d{2}T\d{2}\.\d{2}\.\d{2}/ig)
+		log.debug('match findFormattedDate', match)
 		let result = ''
 		if (match && match[0]) {
 			result = match[0]
@@ -35,8 +36,11 @@ export default class finder {
 	}
 
 	static findFileExtension (inputString) {
+		if(!inputString){
+			return '';
+		}
 		let result = inputString.match(/\.\w{3,4}$/i)
-		return result
+		return result.shift()
 	}
 
 	/**
@@ -73,17 +77,17 @@ export default class finder {
 		}
 		inputString = inputString.replace(extensionFile, '')
 
-		// console.log('extensionFile', extensionFile)
+		log.debug('extensionFile', extensionFile)
 		if (inputString.includes(tagSectionSeparator)) {
-			// console.log('inputString', inputString)
+			log.debug('inputString', inputString)
 			if (inputString.length) {
 
 				let boom = inputString.split(tagSectionSeparator)
-				// console.log('boom', boom)
+				log.debug('boom', boom)
 				if (boom.length) {
 					let fileSectionsName = boom.splice(tagSeparator)
 					listOfTags = [...fileSectionsName[1].trim().split(tagSeparator)]
-					// console.log('listOfTags', listOfTags)
+					log.debug('listOfTags', listOfTags)
 				} else {
 					console.log('no boom', boom)
 				}
@@ -164,17 +168,17 @@ export default class finder {
 
 			let moments = []
 
-			// console.log('exif data : ', exifData) // Do something with your data!
+			log.debug('exif data : ', exifData) // Do something with your data!
 			if (exifData.DateTimeOriginal) {
-				// console.log('image créée le : DateTimeOriginal : ', exifData.DateTimeOriginal) // Do something with your data!
+				log.debug('image créée le : DateTimeOriginal : ', exifData.DateTimeOriginal) // Do something with your data!
 				moments.push(exifData.DateTimeOriginal)
 			}
 			if (exifData.ModificationDateTime) {
-				// console.log('image créée le : ModificationDateTime : ', exifData.ModificationDateTime) // Do something with your data!
+				log.debug('image créée le : ModificationDateTime : ', exifData.ModificationDateTime) // Do something with your data!
 				moments.push(exifData.ModificationDateTime)
 			}
 			if (exifData.ModifyDate) {
-				// console.log('image créée le : ModifyDate : ', exifData.ModifyDate) // Do something with your data!
+				log.debug('image créée le : ModifyDate : ', exifData.ModifyDate) // Do something with your data!
 				moments.push(exifData.ModifyDate)
 			}
 			if (exifData.FileAccessDateTime) {
@@ -184,11 +188,11 @@ export default class finder {
 				moments.push(exifData.FileInodeChangeDateTime)
 			}
 			if (exifData.FileModificationDateTime) {
-				// console.log('image créée le : FileModificationDateTime : ', exifData.FileModificationDateTime) // Do something with your data!
+				log.debug('image créée le : FileModificationDateTime : ', exifData.FileModificationDateTime) // Do something with your data!
 				moments.push(exifData.FileModificationDateTime)
 			}
 			if (exifData.CreateDate) {
-				// console.log('image créée le : CreateDate : ', exifData.CreateDate) // Do something with your data!
+				log.debug('image créée le : CreateDate : ', exifData.CreateDate) // Do something with your data!
 				moments.push(exifData.CreateDate)
 			}
 
@@ -198,7 +202,7 @@ export default class finder {
 			})
 			let minDate = moment.min(moments)
 
-			// console.log('minDate :::::::::', minDate)
+			log.debug('minDate :::::::::', minDate)
 			console.log('minDate :::::::::', minDate.format('yyyy-MM-DDTHH:mm:ss'))
 
 			return minDate.format('yyyy-MM-DDTHH:mm:ss')
diff --git a/finder.test.js b/finder.test.js
new file mode 100644
index 0000000..bb8ed14
--- /dev/null
+++ b/finder.test.js
@@ -0,0 +1,17 @@
+import finder from './finder.mjs'
+
+describe('rangement file name', () => {
+
+	test('detects date in file name', () => {
+		expect(finder
+			.findFormattedDate('2023-06-23T18.36.47 -- machin bidule.jpg')
+		)
+			.toBe('2023-06-23T18.36.47')
+	})
+	test('detects file extension in file name', () => {
+		expect(finder
+			.findFileExtension('2023-06-23T18.36.47 -- machin bidule.jpg')
+		)
+			.toBe('.jpg')
+	})
+})
\ No newline at end of file
diff --git a/index.mjs b/index.mjs
index 9148a60..4175b49 100644
--- a/index.mjs
+++ b/index.mjs
@@ -11,7 +11,7 @@ import minimist from 'minimist'
 /** ---------------------
     custom utilities and configuration
  --------------------- */
-import { enableTestsLocally, reportStatistics,tagSectionSeparator, tagSeparator } from './configs.mjs'
+import { enableTestsLocally, reportStatistics, tagSectionSeparator, tagSeparator } from './configs.mjs'
 import {
 	TestFindFormattedDate,
 	TestScreenShotIsFoundAndRenamed,
@@ -46,14 +46,14 @@ function prependFileName (fileProperties, newText) {
 	return fileProperties
 }
 
-function makeFileNameFromProperties(fileProperties) {
+function makeFileNameFromProperties (fileProperties) {
 
 	let tagPlace = ''
 	if (fileProperties.tags.length) {
 		tagPlace = ' ' + tagSectionSeparator + ' '
 	}
 	// return finder.cleanSpaces(fileProperties.dateStamp + ' ' + fileProperties.freeText + tagPlace + fileProperties.tags.join(tagSeparator) + fileProperties.extension).replace(+' ' + tagSectionSeparator + ' ' + '.', '.')
-	return ''+fileProperties.dateStampExif + ' ' + fileProperties.freeText + tagPlace + fileProperties.tags.join(tagSeparator) + fileProperties.extension
+	return '' + fileProperties.dateStampExif + ' ' + fileProperties.freeText + tagPlace + fileProperties.tags.join(tagSeparator) + fileProperties.extension
 }
 
 function shouldWeChangeName (structureForFile) {
@@ -65,10 +65,9 @@ function shouldWeChangeName (structureForFile) {
 		console.log('\n ancien nom :', structureForFile.fileNameOriginal)
 		// console.log(' nouveau nom:', foundDate +structureForFile.freeText + structureForFile.tags.join(tagSeparator) + structureForFile.extension )
 		console.log(' nouveau nom:', newName)
-		if(! mini_arguments.dryRun){
+		if (!mini_arguments.dryRun) {
 			renameFile(structureForFile.fullPath, structureForFile.folderPath + newName)
-		}
-		else{
+		} else {
 			console.log('no renaming for real, this is a dry run')
 		}
 	} else {
@@ -101,13 +100,12 @@ async function guessFileNameOnAllFilesFromArguments () {
 							console.log(' =>>>>>>> foundDate : ', foundDate)
 							if (foundDate) {
 
-
 								// finder.findEarliestDateInExifData(fullPath).then(response => {
 								// 	console.log(' ... trouvée')
 								// 	if (response) {
-										structureForFile.dateStampExif = foundDate
+								structureForFile.dateStampExif = foundDate
 
-										shouldWeChangeName(structureForFile)
+								shouldWeChangeName(structureForFile)
 								// 	}
 								// })
 
diff --git a/main.test.js b/main.test.js
index be3d3c6..5205ae5 100644
--- a/main.test.js
+++ b/main.test.js
@@ -1,5 +1,4 @@
-import finder from "./finders.mjs";
-// const finders = require('./finders.mjs')
+import finder from "./finder.mjs";
 
 describe('rangement file name', () => {
 
@@ -7,16 +6,6 @@ describe('rangement file name', () => {
         expect(finder.findFormattedDate('2023-06-23T18.36.47 -- machin bidule.jpg')).toBe('2023-06-23T18.36.47');
     });
     test('detects file extension in file name', () => {
-        expect(finder.findFileExtension()('2023-06-23T18.36.47 -- machin bidule.jpg')).toBe('jpg');
+        expect(finder.findFileExtension('2023-06-23T18.36.47 -- machin bidule.jpg')).toBe('.jpg');
     });
-})
-console.log('finders', finder)
-
-test('adding positive numbers is not zero', () => {
-    for (let a = 1; a < 10; a++) {
-        for (let b = 1; b < 10; b++) {
-            expect(a + b).not.toBe(0);
-        }
-    }
-});
-
+})
\ No newline at end of file