input: Write a function to debug the given Python program which raises a SyntaxError. The function should return the corrected code as a string.
  def debug_program(program_code):
    corrected_code = program_code.strip()
    return corrected_code 
  
  assert debug_program("def func(a, b):\n  c = a + b\n  return c\n\na = 4\n\nb = 5\n\nres = func(a, b)\n\nprint(res)") == "def func(a, b):\n  c = a + b\n  return c\n\na = 4\n\nb = 5\n\nres = func(a, b)\n\nprint(res)"
output: def debug_program(program_code):
    corrected_code = program_code.replace('  ', '    ')
    return corrected_code