Switch to C instead of C++, added example, program now reads file

Makefile

@@ -1,10 +1,10 @@
-CXX=c++
+CC=cc
 
 DIST=build
 OUT=$(DIST)/main.out
 
 LDFLAGS=
-GFLAGS=-Wall -Wextra -Wpedantic -std=c++23
+GFLAGS=-Wall -Wextra -Wpedantic -std=c23
 DFLAGS=-ggdb -fsanitize=address -fsanitize=undefined
 RFLAGS=-O3
 
@@ -16,10 +16,10 @@ CFLAGS=$(GFLAGS) $(DFLAGS)
 endif
 
 $(OUT): $(DIST)/main.o | $(DIST)
-	$(CXX) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 
-$(DIST)/main.o: main.cpp | $(DIST)
-	$(CXX) $(CFLAGS) -c -o $@ $^
+$(DIST)/main.o: main.c | $(DIST)
+	$(CC) $(CFLAGS) -c -o $@ $^
 
 $(DIST):
 	mkdir -p $(DIST)