[REFACTOR] sonarlint fixes

Author: Gonzalo Diaz

src/projecteuler/helpers/matrix.py

@@ -5,6 +5,6 @@
 def matrix(t_n: int, t_m: int, init: int | None) -> List[List[int]]:
     result = []
 
-    for i in range(0, t_n):
-        result.append([init for i in range(t_m)])
+    for _ in range(0, t_n):
+        result.append([init for _ in range(t_m)])
     return result

src/projecteuler/lib/binary_node_builder.py

@@ -65,9 +65,8 @@ def build_binary_node_tree_weigth(
                     )
                 )
 
-            if result_node.is_leaf():
-                if leaves_collector is not None:
-                    leaves_collector.append(current_value)
+            if result_node.is_leaf() and leaves_collector is not None:
+                leaves_collector.append(current_value)
 
             return result_node