feat: add prompt and system methods to rpylib.c and remove free build from Makefile

- Added rpylib_prompt and rpylib_system functions to rpylib.c for user and system role OpenAI chat
- Removed build_free target from Makefile and added publish step for rpylib.so build

Makefile

@@ -1,4 +1,4 @@
-all: build run
+all: build build_rpylib run
 
 # Variables for compiler and flags
 CC = gcc
@@ -9,12 +9,9 @@ build:
 	$(CC) main.c $(CFLAGS) -o r
 	publish r
 
-build_free: 
-	$(CC) main.c -DFREE_VERSION $(CFLAGS) -o rf
-	publish rf
-
 build_rpylib:
 	$(CC) -shared -o rpylib.so -fPIC rpylib.c -lpython3.12 `python3-config --includes` -I/usr/include/CL -ljson-c -lcurl
+	publish rpylib.so
 
 run: 
 	./r