Rename todo to scratch

lib/notes.dart

@@ -7,11 +7,11 @@ class Note {
   Note({required this.date, required this.content});
 }
 
-class Todo {
+class Scratch {
   final String date;
-  final String content;
+  String content;
 
-  Todo({required this.date, required this.content});
+  Scratch({required this.date, required this.content});
 }
 
 Future<Note?> getLatestNote() async {
@@ -43,19 +43,21 @@ Future<void> updateNote(Note note) async {
   );
 }
 
-Future<Todo?> getLatestTodo() async {
-  final todo = await DB.db.rawQuery(
-    'SELECT content, date FROM todos ORDER BY date DESC LIMIT 1',
+Future<Scratch?> getLatestScratch() async {
+  final scratch = await DB.db.rawQuery(
+    'SELECT content, date FROM scratches ORDER BY date DESC LIMIT 1',
   );
-  if (todo.isEmpty) {
+
+  if (scratch.isEmpty) {
     return null;
+  } else {
+    return Scratch(
+      date: scratch[0]['date'] as String,
+      content: scratch[0]['content'] as String,
+    );
   }
-  return Todo(
-    date: todo[0]['date'] as String,
-    content: todo[0]['content'] as String,
-  );
 }
 
-Future<void> createTodo(String content) async {
-  await DB.db.insert('todos', {'content': content});
+Future<void> createScratch(String content) async {
+  await DB.db.insert('scratches', {'content': content});
 }