refactor: improve mmkv logic

internal/utils/unicode.go

@@ -0,0 +1,10 @@
+package utils
+
+import "golang.org/x/text/unicode/norm"
+
+// normalizeUnicode normalizes unicode string to NFC.
+// since macOS may change some characters in the file name.
+// e.g. "ぜ"(e3 81 9c) -> "ぜ"(e3 81 9b e3 82 99)
+func NormalizeUnicode(str string) string {
+	return norm.NFC.String(str)
+}