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 no syntax errors are found, return the original code.
  def fix_syntax_errors(code_snippet): pass
  assert fix_syntax_errors("def test (): x = 5 y = 3 z")=="def test(): x = 5 y = 3 try: z except NameError: print('NameError: Name \\'z\\' is not defined')"
  assert fix_syntax_errors("x = 10 n = 5")=="x = 10 n = 5"
  assert fix_syntax_errors("for i in range(5) print(i)")=="for i in range(5): print(i)"
  assert fix_syntax_errors("")==""
output: def fix_syntax_errors(code_snippet):
      try:
          compile(code_snippet, '<string>', 'exec')
          return code_snippet
      except SyntaxError:
          lines = code_snippet.split('\n')
          corrected_lines = []
          for line in lines:
              try:
                  compile(line, '<string>', 'exec')
                  corrected_lines.append(line)
              except SyntaxError:
                  if '=' in line:
                      corrected_lines.append(line)
                  elif 'for' in line and 'in' in line and ':' not in line:
                      corrected_lines.append(line + ':')
                  elif 'def' in line and '(' in line and ')' in line and ':' not in line:
                      corrected_lines.append(line + ':')
                  else:
                      corrected_lines.append(line)
          corrected_code = '\n'.join(corrected_lines)
          return corrected_code