I did not do the method below. Instead, I wrote a script to generate the filename with the non-breaking space where I needed it.

Edit: rewording and typos.

Any way I can see the script? Looks like I am still learning and ended up taking a longer route.

It's Lua 5.3:

    h = "hello" .. utf8.char(160) .. "world"
    
    f = io.open("Makefile","w")
    f:write(h,":\n")
    f:close()
    
    f = io.open(h .. ".c","w")
    f:write([[
    #include <stdio.h>
    
    int main(void)
    {
      puts("Hello, world!");
      return 0;
    }
    ]])
    f:close()

Pretty straightforward.

Could you explain how you did it?

Replacing breaking space with non-breaking space :

1. Set up your compose key on linux(Top right corner settings->system settings->keyboards->shortcut->typing->Compose key(choose an appropriate one)).

2. Whenever you need to type breaking space instead type (compose key + spacebar + spacebar). This puts a non-breaking space there instead. That's it.

3. Create file -> sudo nano hello(compose key + spacebar + spacebar)world.c

4. Paste the code to execute.

5. Makefile-> hello(compose key + space + space)world:

6. make

7. ./hello world (pressing tab will recognise the executable automatically).

NOTE: Don't do this ever in any production code or just ever. This hack can take up hours to resolve and a lot of frustration which could have better been spent on fixing something meaningful. This is a frowned upon practice. The only cool part is that your directory can have two files with whose name look exactly the same.