title: How To Turn Off A Particular Bit In A Number
signature: function how_to_turn_off_a_particular_bit_in_a_number(n, k)
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(n, k, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(n, k) 
      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(49, 15, 49)
      print(string.format("TEST-0...%s",result))
  
      result = driver(59, 69, 59)
      print(string.format("TEST-1...%s",result))
  
      result = driver(76, 20, 76)
      print(string.format("TEST-2...%s",result))
  
      result = driver(27, 76, 27)
      print(string.format("TEST-3...%s",result))
  
      result = driver(61, 60, 61)
      print(string.format("TEST-4...%s",result))
  
      result = driver(67, 27, 67)
      print(string.format("TEST-5...%s",result))
  
      result = driver(63, 71, 63)
      print(string.format("TEST-6...%s",result))
  
      result = driver(85, 25, 85)
      print(string.format("TEST-7...%s",result))
  
      result = driver(90, 64, 90)
      print(string.format("TEST-8...%s",result))
  
      result = driver(24, 55, 24)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def how_to_turn_off_a_particular_bit_in_a_number(n, k):
      if (k <= 0):
          return n
      return (n & (~ (1 << (k - 1))))
source_cpp: int how_to_turn_off_a_particular_bit_in_a_number(int n, int k) {
    if ( k <= 0 ) return n;
    return ( n & ~ ( 1 << ( k - 1 ) ) );
  }