Added LICENSE file

and that dependencies are included into Makefile

.gitignore

@@ -0,0 +1,5 @@
+a.out
+example
+*.swp
+*.o
+*.d

LICENSE

@@ -0,0 +1,8 @@
+The MIT License (MIT)
+Copyright © 2025 Stephan Rehfeld
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Makefile

@@ -1,7 +1,29 @@
-example: main.c
-	cc main.c -o example
+PROJECT = example
 
-.PHONY: clean
+CFLAGS += -Wall -Wextra -pedantic -Werror -std=c23
+
+# For Debug Build
+CFLAGS += -g -O0
+
+# For Release Build
+#CFLAGS += -O3 -DNDEBUG
+
+SOURCES = $(wildcard *.c)
+OBJECTS = $(SOURCES:.c=.o)
+DEPENDS = $(SOURCES:.c=.d)
+DEPFLAGS = -MMD -MP
+
+$(PROJECT): $(OBJECTS)
+	$(CC) $(OBJECTS) -o $@
+
+%.o: %.c
+	$(CC) $(CFLAGS) $(DEPFLAGS) -c $< -o $@
+
+-include $(DEPENDS)
+
+.PHONY: clean all
+
+all: $(PROJECT)
 
 clean:
-	rm -f example
+	rm -f $(PROJECT) $(OBJECTS) $(DEPENDS)

bar.c

@@ -0,0 +1,7 @@
+#include "bar.h"
+
+#include <stdio.h>
+
+void bar(void) {
+	puts("Hello World from bar().");
+}

bar.h

@@ -0,0 +1,6 @@
+#ifndef BAR_H
+#define BAR_H
+
+void bar(void);
+
+#endif

foo.c

@@ -0,0 +1,7 @@
+#include "foo.h"
+
+#include <stdio.h>
+
+void foo(void) {
+	puts("Hello World from foo().");
+}

foo.h

@@ -0,0 +1,6 @@
+#ifndef FOO_H
+#define FOO_H
+
+void foo(void);
+
+#endif

main.c

@@ -1,7 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "foo.h"
+#include "bar.h"
+
 int main(void) {
 	puts("Hello World");
+	foo();
+	bar();
 	return EXIT_SUCCESS;
 }