diff --git a/app/src/main/java/eu/kanade/tachiyomi/source/online/all/EHentai.kt b/app/src/main/java/eu/kanade/tachiyomi/source/online/all/EHentai.kt
index 340637283..96c5bcece 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/source/online/all/EHentai.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/source/online/all/EHentai.kt
@@ -41,7 +41,6 @@ import exh.metadata.metadata.EHentaiSearchMetadata.Companion.TAG_TYPE_WEAK
 import exh.metadata.metadata.base.RaisedSearchMetadata.Companion.TAG_TYPE_VIRTUAL
 import exh.metadata.metadata.base.RaisedSearchMetadata.Companion.toGenreString
 import exh.metadata.metadata.base.RaisedTag
-import exh.metadata.nullIfBlank
 import exh.metadata.parseHumanReadableByteCount
 import exh.ui.login.LoginController
 import exh.ui.metadata.adapters.EHentaiDescriptionAdapter
@@ -49,6 +48,7 @@ import exh.util.UriFilter
 import exh.util.UriGroup
 import exh.util.asObservableWithAsyncStacktrace
 import exh.util.ignore
+import exh.util.nullIfBlank
 import exh.util.trimOrNull
 import exh.util.urlImportFetchSearchManga
 import java.net.URLEncoder
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsEhController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsEhController.kt
index b624ae8ed..92fb557d7 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsEhController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsEhController.kt
@@ -44,10 +44,10 @@ import exh.favorites.FavoritesIntroDialog
 import exh.favorites.LocalFavoritesStorage
 import exh.metadata.metadata.EHentaiSearchMetadata
 import exh.metadata.metadata.base.getFlatMetadataForManga
-import exh.metadata.nullIfBlank
 import exh.uconfig.WarnConfigureDialogController
 import exh.ui.login.LoginController
 import exh.util.await
+import exh.util.nullIfBlank
 import exh.util.trans
 import humanize.Humanize
 import java.util.Date
diff --git a/app/src/main/java/exh/metadata/MetadataUtil.kt b/app/src/main/java/exh/metadata/MetadataUtil.kt
index 83d8608a6..36b834b81 100755
--- a/app/src/main/java/exh/metadata/MetadataUtil.kt
+++ b/app/src/main/java/exh/metadata/MetadataUtil.kt
@@ -2,6 +2,8 @@ package exh.metadata
 
 import java.text.SimpleDateFormat
 import java.util.Locale
+import kotlin.math.ln
+import kotlin.math.pow
 
 /**
  * Metadata utils
@@ -9,9 +11,9 @@ import java.util.Locale
 fun humanReadableByteCount(bytes: Long, si: Boolean): String {
     val unit = if (si) 1000 else 1024
     if (bytes < unit) return "$bytes B"
-    val exp = (Math.log(bytes.toDouble()) / Math.log(unit.toDouble())).toInt()
+    val exp = (ln(bytes.toDouble()) / ln(unit.toDouble())).toInt()
     val pre = (if (si) "kMGTPE" else "KMGTPE")[exp - 1] + if (si) "" else "i"
-    return String.format("%.1f %sB", bytes / Math.pow(unit.toDouble(), exp.toDouble()), pre)
+    return String.format("%.1f %sB", bytes / unit.toDouble().pow(exp.toDouble()), pre)
 }
 
 private const val KB_FACTOR: Long = 1000
@@ -35,12 +37,6 @@ fun parseHumanReadableByteCount(arg0: String): Double? {
     return null
 }
 
-fun String?.nullIfBlank(): String? = if (isNullOrBlank()) {
-    null
-} else {
-    this
-}
-
 fun <K, V> Set<Map.Entry<K, V>>.forEach(action: (K, V) -> Unit) {
     forEach { action(it.key, it.value) }
 }
diff --git a/app/src/main/java/exh/ui/batchadd/BatchAddPresenter.kt b/app/src/main/java/exh/ui/batchadd/BatchAddPresenter.kt
index acc87b9fc..65466229c 100644
--- a/app/src/main/java/exh/ui/batchadd/BatchAddPresenter.kt
+++ b/app/src/main/java/exh/ui/batchadd/BatchAddPresenter.kt
@@ -8,7 +8,7 @@ import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
 import exh.GalleryAddEvent
 import exh.GalleryAdder
-import exh.metadata.nullIfBlank
+import exh.util.trimOrNull
 import kotlin.concurrent.thread
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
@@ -42,7 +42,7 @@ class BatchAddPresenter : BasePresenter<BatchAddController>() {
             galleries
         }
         val splitGalleries = testedGalleries.split("\n").mapNotNull {
-            it.trim().nullIfBlank()
+            it.trimOrNull()
         }
 
         progressRelay.call(0)
diff --git a/app/src/main/java/exh/util/StringUtil.kt b/app/src/main/java/exh/util/StringUtil.kt
index 35bfed166..e426d7c3f 100644
--- a/app/src/main/java/exh/util/StringUtil.kt
+++ b/app/src/main/java/exh/util/StringUtil.kt
@@ -12,3 +12,9 @@ fun String.trimOrNull(): String? {
     val trimmed = trim()
     return if (trimmed.isBlank()) null else trimmed
 }
+
+fun String?.nullIfBlank(): String? = if (isNullOrBlank()) {
+    null
+} else {
+    this
+}