title: Perfect Reversible String
signature: function perfect_reversible_string(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("ab", false)
      print(string.format("TEST-0...%s",result))
  
      result = driver("303", true)
      print(string.format("TEST-1...%s",result))
  
      result = driver("11110000", false)
      print(string.format("TEST-2...%s",result))
  
      result = driver("aba", true)
      print(string.format("TEST-3...%s",result))
  
      result = driver("404", true)
      print(string.format("TEST-4...%s",result))
  
      result = driver("10101", true)
      print(string.format("TEST-5...%s",result))
  
      result = driver("abab", false)
      print(string.format("TEST-6...%s",result))
  
      result = driver("6366", false)
      print(string.format("TEST-7...%s",result))
  
      result = driver("001", false)
      print(string.format("TEST-8...%s",result))
  
      result = driver("", true)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def perfect_reversible_string(str):
      i = 0
      j = (len(str) - 1)
      while (i < j):
          if (str[i] != str[j]):
              return False
          i += 1
          j -= 1
      return True
source_cpp: bool perfect_reversible_string(string str) {
    int i = 0, j = str . length ( ) - 1;
    while ( i < j ) {
      if ( str [ i ] != str [ j ] ) return false;
      i ++;
      j --;
    }
    return true;
  }