input: Write a function to identify and correct the syntax errors in the given Python program. Return the corrected code as a string. If no errors are found, return the original code.
  
  def debug_syntax_error(code):
    try:
      exec(code)
      return code
    except SyntaxError as e:
      return str(e)
    
  assert debug_syntax_error("def func(a, b): \n  c = a + b \n  return c \n\na = 4 \nb = 5 \n\nres = func(a, b) \nprint(res)")=="def func(a, b): \n  c = a + b \n  return c \n\na = 4 \nb = 5 \n\nres = func(a, b) \nprint(res)"
output: def debug_syntax_error(code):
      try:
          exec(code)
          return code
      except SyntaxError as e:
          return str(e)