Converts map with keys as strings to keys as atoms.

string_to_atom.exs

defmodule Service.MiscScripts do

    @doc """
    Changes String Map to Map of Atoms e.g. %{"c"=> "d", "x" => %{"yy" => "zz"}} to
            %{c: "d", x: %{yy: "zz"}}, i.e changes even the nested maps.
    """
   
    def  convert_to_atom_map(map), do: to_atom_map(map)
       
    defp to_atom_map(map) when is_map(map), do: Map.new(map, fn {k,v} -> {String.to_atom(k),to_atom_map(v)} end)  
    defp to_atom_map(map) when is_list(map) do
        Enum.map(map, fn x ->
            to_atom_map(x)            
        end) 
    end 
    defp to_atom_map(v), do: v

end