diff --git a/app/src/main/java/io/legado/app/utils/StringExtensions.kt b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
new file mode 100644
index 000000000..957d5b091
--- /dev/null
+++ b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
@@ -0,0 +1,3 @@
+package io.legado.app.utils
+
+fun String?.strim() = if (this.isNullOrBlank()) null else this.trim()
\ No newline at end of file