title: Find Unit Digit X Raised Power Y
signature: function find_unit_digit_x_raised_power_y(x, y)
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(x, y, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(x, y) 
      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(33, 55, 7)
      print(string.format("TEST-0...%s",result))
  
      result = driver(95, 7, 5)
      print(string.format("TEST-1...%s",result))
  
      result = driver(21, 63, 1)
      print(string.format("TEST-2...%s",result))
  
      result = driver(3, 62, 9)
      print(string.format("TEST-3...%s",result))
  
      result = driver(40, 53, 0)
      print(string.format("TEST-4...%s",result))
  
      result = driver(64, 24, 6)
      print(string.format("TEST-5...%s",result))
  
      result = driver(17, 23, 3)
      print(string.format("TEST-6...%s",result))
  
      result = driver(58, 74, 4)
      print(string.format("TEST-7...%s",result))
  
      result = driver(44, 13, 4)
      print(string.format("TEST-8...%s",result))
  
      result = driver(27, 54, 9)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def find_unit_digit_x_raised_power_y(x, y):
      res = 1
      for i in range(y):
          res = ((res * x) % 10)
      return res
source_cpp: int find_unit_digit_x_raised_power_y(int x, int y) {
    int res = 1;
    for ( int i = 0;
    i < y;
    i ++ ) res = ( res * x ) % 10;
    return res;
  }