Provide more useful exampels (#1853)
Provide more useful exampels (#1853)

change input data of String.downcase
nscyclone/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir_school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir-school