Saving file and dealing with all errors.

src/main.rs

@@ -1,4 +1,5 @@
 use eframe::egui;
+use std::io::Write as _;
 
 use billy_sheet::gui::SheetGui;
 
@@ -40,16 +41,20 @@ impl eframe::App for Gui {
                         _frame.close();
                     }
                     if ui.button("Save in json").clicked() {
-                        let sheet_str = serde_json::to_string(&self.sheet);
-                        let path = std::path::Path::new("./sheet.json");
-                        if path.exists() {
-                            if let Err(a) = std::fs::remove_file(path) {
-                                println!("{a}");
-                            } else {
-                                
+                        let result = serde_json::to_string_pretty(&self.sheet);
+                        match result {
+                            Ok(sheet_str) => {
+                                let path = std::path::Path::new("./sheet.json");
+                                match std::fs::File::create(path) {
+                                    Ok(mut file) => {
+                                        if let Err(err) = write!(file, "{}", sheet_str) {
+                                            println!("{err}");
+                                        }
+                                    }
+                                    Err(error) => println!("{error}"),
+                                }
                             }
-                        } else {
-
+                            Err(error) => println!("{error}"),
                         }
                     }
                 });