input: def fix_syntax_errors(code_snippet: str) -> str:
      """ Modify the given Python code snippet to fix syntax errors.
      Specifically, detect when a variable is used without being properly defined and
      handle it using a try-except block to print an appropriate error message.
      >>> fix_syntax_errors("def test ():\n    x = 5\n    y = 3 \n    z")
      'def test():\n    x = 5\n    y = 3\n    try:\n        z\n    except NameError:\n        print("NameError: Name \'z\' is not defined")'
      """
output:     lines = code_snippet.split('\n')
      fixed_lines = []
      for line in lines:
          if '=' not in line and not line.strip().startswith('#'):
              fixed_lines.append(f'    try:\n        {line.strip()}\n    except NameError:\n        print("NameError: Name \'{line.split()[0]}\' is not defined")')
          else:
              fixed_lines.append(line)
      return '\n'.join(fixed_lines)