input: Write a python function to format source code using the given function.
  assert format_source_code("def add(a,b): return a+b") == "def add(a, b):\n    return a + b\n"
  assert format_source_code("x=  3*y+5") == "x = 3 * y + 5\n"
  assert format_source_code("if a:print(a)") == "if a:\n    print(a)\n"
output: def format_source_code(code: str) -> str:
      import autopep8
      return autopep8.fix_code(code)