Fixed compile

Author: javadev

src/main/elixir/g0001_0100/s0051_n_queens/readme.md

@@ -63,7 +63,7 @@ defmodule Solution do
   end
 
   defp normalize(board, n) do
-    for {{x, y}, i} <- Enum.with_index(board) do
+    for { {x, y}, i} <- Enum.with_index(board) do
       0..n-1
       |> Enum.map(fn j ->
         if {n - i - 1, j} == {x, y}, do: "Q", else: "."