def text_normalizer(str_before)
  str_after = str_before.downcase
  str_after.gsub!(/ś/,"s")
  str_after.gsub!(/ł/,"l")
  str_after.gsub!(/ń/,"n")
  str_after.gsub!(/ć/,"c")
  str_after.gsub!(/ź/,"z")
  str_after.gsub!(/ż/,"z")
  str_after.gsub!(/ą/,"a")
  str_after.gsub!(/ę/,"e")
  str_after.gsub!(/ó/,"o")
  str_after.gsub!(/Ś/,"s")
  str_after.gsub!(/Ł/,"l")
  str_after.gsub!(/Ń/,"n")
  str_after.gsub!(/Ć/,"c")
  str_after.gsub!(/Ź/,"z")
  str_after.gsub!(/Ż/,"z")
  str_after.gsub!(/Ą/,"a")
  str_after.gsub!(/Ę/,"e")
  str_after.gsub!(/Ó/,"o")
  str_after.gsub(/[^\w\.\-]/,'-').gsub(/([-]+)/,'-')
end