title: Print Words String Reverse Order
signature: function print_words_string_reverse_order(str)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(str, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(str) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver("m Dm YZ", "YZ Dm m")
      print(string.format("TEST-0...%s",result))
  
      result = driver("65 48 57 71", "71 57 48 65")
      print(string.format("TEST-1...%s",result))
  
      result = driver("01 010", "010 01")
      print(string.format("TEST-2...%s",result))
  
      result = driver("mT vhByi", "vhByi mT")
      print(string.format("TEST-3...%s",result))
  
      result = driver("19 44 9 1", "1 9 44 19")
      print(string.format("TEST-4...%s",result))
  
      result = driver("0", "0")
      print(string.format("TEST-5...%s",result))
  
      result = driver("z vUi  ", "  vUi z")
      print(string.format("TEST-6...%s",result))
  
      result = driver("7 591 36643 9 055", "055 9 36643 591 7")
      print(string.format("TEST-7...%s",result))
  
      result = driver("01", "01")
      print(string.format("TEST-8...%s",result))
  
      result = driver("ti YGaijPY", "YGaijPY ti")
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def print_words_string_reverse_order(str):
      i = (len(str) - 1)
      start = end = (i + 1)
      result = ''
      while (i >= 0):
          if (str[i] == ' '):
              start = (i + 1)
              while (start != end):
                  result += str[start]
                  start += 1
              result += ' '
              end = i
          i -= 1
      start = 0
      while (start != end):
          result += str[start]
          start += 1
      return result
source_cpp: string print_words_string_reverse_order(string str) {
    int i = str . length ( ) - 1;
    int start, end = i + 1;
    string result = "";
    while ( i >= 0 ) {
      if ( str [ i ] == ' ' ) {
        start = i + 1;
        while ( start != end ) result += str [ start ++ ];
        result += ' ';
        end = i;
      }
      i --;
    }
    start = 0;
    while ( start != end ) result += str [ start ++ ];
    return result;
  }