Added comments and slightly refactored code for deletion of temp node

src/infrastructure/node_manager.zig

@@ -118,16 +118,20 @@ pub const NodeManager = struct {
         return null;
     }
 
+    /// Essentially what it does is it sets temp node pointer to null and
+    /// if the node it pointed at had no road references (essentially it was a new node for road building),
+    /// it deletes the node from the node list as well
     pub fn deleteTempNode(self: *NodeManager, allocator: std.mem.Allocator) void {
         if (self.temp_node == null) return;
 
         const node = self.temp_node.?;
-        if (node.roads.items.len == 0)
-            self.deleteNode(allocator, node) catch |err| {
-                std.debug.panic("Failed to delete the temporary node: {}\n", .{err});
-            };
-
         self.temp_node = null;
+
+        if (node.roads.items.len != 0) return;
+        self.deleteNode(allocator, node) catch |err| {
+            std.debug.panic("Failed to delete the temporary node: {}\n", .{err});
+        };
+
     }
 };