fix: trialing new line

Signed-off-by: tison <[email protected]>

fmt/src/document/mod.rs

@@ -12,7 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::{borrow::Cow, collections::HashMap, fs, fs::File, io::BufRead, path::PathBuf};
+use std::{
+    borrow::Cow,
+    collections::HashMap,
+    fs::File,
+    io::{BufRead, Write},
+    path::PathBuf,
+};
 
 use snafu::ResultExt;
 
@@ -126,9 +132,16 @@ impl Document {
 
     pub fn save(&mut self, filepath: Option<&PathBuf>) -> Result<()> {
         let filepath = filepath.unwrap_or(&self.filepath);
-        fs::write(filepath, self.parser.file_content.content()).context(SaveDocumentSnafu {
+        let mut file = File::create(filepath).context(SaveDocumentSnafu {
             path: filepath.display().to_string(),
-        })
+        })?;
+        let content = self.parser.file_content.content();
+        for line in content.lines() {
+            writeln!(file, "{line}").context(SaveDocumentSnafu {
+                path: filepath.display().to_string(),
+            })?;
+        }
+        Ok(())
     }
 
     pub(crate) fn merge_properties(&self, s: &str) -> String {