How do you choose a language for a project?

Question

For example: If you want to allocate memory for your program. C may be your choice. If you want to create simple windows, you may want to use C#.

Answer 1

I would use Google and try to find out which tools are typically used for that sort of project.
Like for Android apps you may find out that you typically use Java or recently Kotlin, because these languages are directly supported.
Furthermore, if you figure out a few more inconveniences, you can also do it with other languages like C++, C# or Python.
I would then, considering my own goals, skills, resources, try to assess, if I either already know the needed languages (lucky me), or if I want to learn from scratch what's needed, or if I want to use one of the second-bests.
In my case, I know Python, but not Java or Kotlin, so for this example I'd have to decide if I want to learn a new language from scratch or go with Python and accept the difficulties and disadvantages.
I'd decide for a course of action - and then I'd get to work. ;-)