a girl and a rat

[littlebaby]

hi all, here's a story I've made.

Once upon a time, there was a girl. One day, the girl saw a rat. The rat said 'I'm very hungry, can you give me some food to eat?' The girl said 'No, but if you can sing a song, I'll give you some food.' The rat replied 'Yes. Have you seen the muffin man the muffin man the muffin man. Have you seen the muffin man who lives in Drury Lane' The girl was very happy to hear that and then she gave the rat some food. The rat was very happy and full after eating such delicious food.

Is there anyone who can tell me if there's any mistake?

[dungtai]

.... Have you seen a muffin man, the muffin man, the muffin man? Have you seen the muffin man, who lives in Drury Lane?".

That's my answer, but I am not sure if it is wright or wrong to you?