refactor(dosages): resolved clippy warnings

src/combo_graph.rs

@@ -62,7 +62,7 @@ impl ComboGraph {
             .map(|(pos, combo)| (max(self.target.abs_diff(*pos), 1), combo.weight(), pos))
             .min()?;
 
-        self.nodes.get(&closest.2)
+        self.nodes.get(closest.2)
     }
 
     /// Visit a combo and calculate its position and weight
@@ -110,8 +110,7 @@ impl ComboGraph {
         let combo = self.nodes.get(&self.target)?;
         Some(
             (0..self.values.len())
-                .map(|i| vec![self.values[i]; combo[i] as usize])
-                .flatten()
+                .flat_map(|i| vec![self.values[i]; combo[i] as usize])
                 .collect(),
         )
     }
@@ -120,8 +119,7 @@ impl ComboGraph {
         let combo = self.closest_node_target()?;
         Some(
             (0..self.values.len())
-                .map(|i| vec![self.values[i]; combo[i] as usize])
-                .flatten()
+                .flat_map(|i| vec![self.values[i]; combo[i] as usize])
                 .collect(),
         )
     }