My Sims Agent DS: Violet Fireworks SOS!

I didn't do it like that. Violet asked me about the fireworks, and I went to see Hopkins. He told me it would take 2 months... but he also gave me some small fireworks. Then I went to give them to Violet, but she told me it wasn't what she wanted, so she gave them back to me. After that, I went to see Hopkins again, but he wasn't saying anything interesting, so I went home and talked to Jérémy (my assistant), who told me he had spoken with Martin and that he knew a professor. So I went to see Martin, who gave me his number (for the professor). I went to call from home (in my secret room), and he asked for small fireworks and flower seeds, I think (or something else, I don't remember). Since I already had the small fireworks, I went to see Violet, and she gave me the flower seeds. I went to see Martin, who told me he would bring the things to the professor, and then I took a little tour until morning. After that, a film appears; you go to the station, and Martin arrives, giving you the machine for making fireworks. Then I went to give the machine to Violet and went back home to sleep until night. I went to see Violet, I talked to her, and I clicked on mini-game and mission accomplished.

Hi, I sold the game a long time ago but I remember a bit.
Violet, the flower seller, asks you for fireworks in the shape of a flower.
But you need the mayor's approval.
So go see Hopkins, talk to him and he'll tell you that he agrees but doesn't know where to find them. Then he mentions that he remembers Martin, the taxi driver, used to work for a professor, a scientist (sorry but I can't remember his name).
So, the same thing, go see Martin, talk to him and he'll tell you that he indeed remembers him and gives you the scientist's phone number. Run to the nearest phone booth and call the professor. He'll tell you that he will make the fireworks machine and asks you to wait while it's being made. Take a walk and then come back to the booth. He'll tell you that he has finished his work and will hand it over to Martin. Go see Martin, take a walk and then come back to pick up the fireworks and the machine from Martin.
There you go, I hope I was helpful.
See you soon.

I didn't find it either, but in any case, we need to go see the mayor.