Add submodule

.gitmodules

+[submodule "git-tutorial-submodule"]
+	path = git-tutorial-submodule
+	url = https://gitlab-beta.engr.illinois.edu/arn2/git-tutorial-submodule

Makefile

-src = $(wildcard *.c)
-obj = $(src:.c=.o)
+src = main.c git-tutorial-submodule/func.c
+inc = git-tutorial-submodule
 
 main: $(obj)
-	$(CC) -o $@ $^
+	$(CC) $(src) -I $(inc) -o $@ $^
 
 .PHONY: clean
 clean:
-	rm -f $(obj) myprog
+	rm -f $(obj) main

git-tutorial-submodule @ bab00d82

+Subproject commit bab00d828873d96bd237d9b96426f7b9a99b1393

main.c

 #include <stdio.h>
+#include "func.h"
 
 int main() {
+    func();
     printf("Hello new flight software members!\n");
 }