Question about Street Fighter and DBZ

[Darkfenian]

I've notice that there is a great similarity to Ruy/Ken's Hadoken and Goku's Kamehameha attack.

1. Both are signature attacks of the main protagonist.
2. Both fire energy with striking similar preparation and finishing stances
3. They weren't developed by the characters but learned by their masters (Master Roshi and Gouken). Though Goku learned it by just watching Roshi he did technically learned it from him.
4. They were the first energy attacks of the series.
5. Hadoken means "surge fist" or "wave motion fist" while the Japanese call the Kamehameha the "turtle devastation wave" or "turtle destruction wave"
6. Even though it's mostly know to be used by Ryu and Goku It can be customized which many of the characters have done. In Street Fighter you have Ken, Akuma, Gouken, Sakura, and Dan Habiki. In DBZ you have Krillin, Vegeta, Master Roshi, Gohan, and Yamcha.

So my question is did one copy the other or is it just one weird coincidence?

Series started
Dragonball 1984
Street Fighter (or Fighting Street) 1987

The first time the Kamehameha was shown was in a magna at 1985 and the anime in 1986.

Both would assume that Street Fighter took it from Dragonball but I have not real proof to support this.