Remove unused FileInfoError variant

src/file.rs

@@ -40,10 +40,7 @@ impl TryFrom<PathBuf> for FileNameInfo {
       match file_name.rsplit_once(b'.').filter(|(_, ending)| {
         //there are usually no file extensions which are just a number, but rather versions
         // -> don't use split if ending is number
-        match ending.to_str() {
-          Some(ending) if ending.parse::<u32>().is_ok() => false,
-          _ => true,
-        }
+        !matches!(ending.to_str(), Some(ending) if ending.parse::<u32>().is_ok())
       }) {
         Some((name, ending)) => (name, Some(ending.to_os_string())),
         None => (file_name, None),
@@ -75,14 +72,12 @@ impl Display for FileNameInfo {
 #[derive(Debug)]
 pub enum FileInfoError {
   NotAFile,
-  InvalidCharactersInFileName,
 }
 
 impl Display for FileInfoError {
   fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
     match self {
       FileInfoError::NotAFile => write!(f, "Path doesn't point to a file"),
-      FileInfoError::InvalidCharactersInFileName => write!(f, "Invalid characters in file name"),
     }
   }
 }