Makefile to compile single C

Question: Standard makefile seems to compile all C source code in a folder as parts of a single object (or “project”). I need to compile every single C source in folder, in fact, just the C source that is being edited (as happens with VisualStudioCode) instead of all C programs in folder. What is the variable name for the program that is being edited to pass to makefile to compije just that?
Thank You!

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I looked at the makefile, and you would most likely have to rewrite the entire thing if you want that.