diff --git a/.gitignore b/.gitignore
index eb0b35b..7fc5b58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,6 @@
+src/*.o
 tmp/
+fun
+fun_test
+test_oppcodes
 test.*
diff --git a/Makefile b/Makefile
index 9944fec..c58ce7f 100644
--- a/Makefile
+++ b/Makefile
@@ -11,9 +11,9 @@ TEST_BIN = $(TEST_SRC:src/%.c=%)
 .PHONY: all test clean
 
 # Default: build main demo
-all: main
+all: fun
 
-main: $(OBJ) src/main.c
+fun: $(OBJ) src/fun.c
 	$(CC) $(CFLAGS) -o $@ $^
 
 # Compile object files
diff --git a/src/main.c b/src/fun.c
similarity index 100%
rename from src/main.c
rename to src/fun.c