chore: Removed mut methods of Position

Author: ngeor

rusty_common/src/position.rs

@@ -12,13 +12,12 @@ impl Position {
         Self { row, col }
     }
 
-    pub fn inc_col(&mut self) {
-        self.col += 1
+    pub fn inc_col(self) -> Self {
+        Self::new(self.row, self.col + 1)
     }
 
-    pub fn inc_row(&mut self) {
-        self.row += 1;
-        self.col = 1;
+    pub fn inc_row(self) -> Self {
+        Self::new(self.row + 1, 1)
     }
 
     pub fn start() -> Self {

rusty_parser/src/pc/string_view.rs

@@ -17,9 +17,8 @@ impl StringView {
         if self.row_col.is_empty() {
             Position::start()
         } else {
-            let mut pos = self.row_col[self.row_col.len() - 1];
-            pos.inc_col();
-            pos
+            let final_pos = self.row_col[self.row_col.len() - 1];
+            final_pos.inc_col()
         }
     }
 }