diff --git a/retrofitLib/build.gradle b/retrofitLib/build.gradle
index bcd845c..5750b7f 100644
--- a/retrofitLib/build.gradle
+++ b/retrofitLib/build.gradle
@@ -11,8 +11,6 @@ android {
         minSdkVersion 14
         targetSdkVersion 30
 
-        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
-
         compileOptions {
             sourceCompatibility = '1.8'
             targetCompatibility = '1.8'
@@ -46,7 +44,6 @@ dependencies {
 
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.1"
 
-    implementation 'com.github.zeropercenthappy:ZPHAndroidUtils:1.4.1'
     api "com.squareup.okhttp3:okhttp:$okhttp_version"
     api "com.squareup.retrofit2:retrofit:$retrofit_version"
     api "com.squareup.retrofit2:converter-gson:$retrofit_version"
diff --git a/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/RequestBodyBuilder.kt b/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/RequestBodyBuilder.kt
index c3c1dcd..7ec73b1 100644
--- a/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/RequestBodyBuilder.kt
+++ b/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/RequestBodyBuilder.kt
@@ -1,6 +1,6 @@
 package com.zeropercenthappy.retrofitutil
 
-import com.zeropercenthappy.utilslibrary.utils.FileUtils
+import com.zeropercenthappy.retrofitutil.ext.mimeType
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
 import okhttp3.MultipartBody
 import okhttp3.RequestBody
@@ -18,15 +18,11 @@ object RequestBodyBuilder {
     fun createMultipartBodyPartList(fileMap: Map<String, File>): List<MultipartBody.Part> {
         val partList = arrayListOf<MultipartBody.Part>()
         for (key in fileMap.keys) {
-            val file = fileMap[key]
-            file?.apply {
-                val mimeType = FileUtils.getFileMimeType(file)
-                mimeType?.apply {
-                    val requestBody = file.asRequestBody(mimeType.toMediaTypeOrNull())
-                    val part = MultipartBody.Part.createFormData(key, file.name, requestBody)
-                    partList.add(part)
-                }
-            }
+            val file = fileMap[key] ?: continue
+            val mimeType = file.mimeType.takeIf { it.isNotEmpty() } ?: continue
+            val requestBody = file.asRequestBody(mimeType.toMediaTypeOrNull())
+            val part = MultipartBody.Part.createFormData(key, file.name, requestBody)
+            partList.add(part)
         }
         return partList
     }
diff --git a/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/ext/FileExt.kt b/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/ext/FileExt.kt
new file mode 100644
index 0000000..db62659
--- /dev/null
+++ b/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/ext/FileExt.kt
@@ -0,0 +1,20 @@
+package com.zeropercenthappy.retrofitutil.ext
+
+import android.webkit.MimeTypeMap
+import java.io.File
+import java.io.InputStream
+
+val File.mimeType: String
+    get() = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension) ?: ""
+
+fun File.writeFromInputStream(inputStream: InputStream): Boolean {
+    return try {
+        this.outputStream().buffered().use { output ->
+            inputStream.copyTo(output)
+        }
+        true
+    } catch (e: Exception) {
+        e.printStackTrace()
+        false
+    }
+}
\ No newline at end of file
diff --git a/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/service/download/DownloadService.kt b/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/service/download/DownloadService.kt
index 52cc40d..7d04452 100644
--- a/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/service/download/DownloadService.kt
+++ b/retrofitLib/src/main/java/com/zeropercenthappy/retrofitutil/service/download/DownloadService.kt
@@ -5,7 +5,7 @@ import android.app.IntentService
 import android.content.Context
 import android.content.Intent
 import com.zeropercenthappy.retrofitutil.RetrofitBuilder
-import com.zeropercenthappy.utilslibrary.utils.FileUtils
+import com.zeropercenthappy.retrofitutil.ext.writeFromInputStream
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.runBlocking
 import java.io.File
@@ -54,7 +54,8 @@ class DownloadService : IntentService("DownloadService") {
 
     @Suppress("UNCHECKED_CAST")
     override fun onHandleIntent(intent: Intent?) {
-        downloadMap = intent?.getSerializableExtra(EXTRA_DOWNLOAD_MAP) as Map<String, File>? ?: return
+        downloadMap =
+            intent?.getSerializableExtra(EXTRA_DOWNLOAD_MAP) as Map<String, File>? ?: return
         download()
     }
 
@@ -67,8 +68,7 @@ class DownloadService : IntentService("DownloadService") {
                 continue
             }
             val responseBody = api.download(url)
-            val result = FileUtils.writeFileByIS(cacheFile, responseBody.byteStream())
-
+            val result = cacheFile.writeFromInputStream(responseBody.byteStream())
             // Download success, move cache file to destination file
             if (result) {
                 cacheFile.renameTo(destinationFile)