compile all library source code: gcc -c [file.c]

bundle them into a library rm .\mylib.a ar rcs .\mylib.a *.o

update library with single new compiled source code gcc -c [file.c] ar rcs .\mylib.a [file.o]

compile the main source file gcc .\src\main.c .\mylib.a -o .\textFixer.exe