Gulp: Combining styles from two source folders into one production?

Question

css

There are many files with styles, you need to split them into two folders like:
tpl-1/
------tpl-1-filename.scss
...
tpl-2/
------tpl-2-filename. scss
...
But the problem is that everything should be collected in one folder.
For example:
build/
------tpl-1-filename.scss
------tpl-2-filename.scss
Question:
How can I make files from the tpl-1 and tpl-2 folders be collected in the build folder?
The path to the sources in gulp.src I have the following 'src/style/**/*.scss'
So far, I see the option to split into two tasks with different paths like 'src/style/tpl-1/*.scss' and ' src/style/tpl-2/*.scss'and throw everything into one, but this option seems like a crutch.
Maybe it's possible in some other way?