input: Write a function to detect and fix Python syntax errors in a given code snippet. The function should return the corrected code as a string. If there are no syntax errors, the function should return the original code.
  def fix_syntax_errors(code):
      try:
          compile(code, '<string>', 'exec')
          return code
      except SyntaxError as e:
          return str(e)
  
  assert fix_syntax_errors("def test ():\nx = 5\ny = 3\nz") == "NameError: Name 'z' is not defined"
  assert fix_syntax_errors("def test():\nx = 5\ny = 3\nz = x + y") == "def test():\nx = 5\ny = 3\nz = x + y"
  assert fix_syntax_errors("") == ""
output: def fix_syntax_errors(code):
      try:
          compile(code, '<string>', 'exec')
          return code
      except SyntaxError as e:
          return str(e)