fix: now compiles and works for simple commands + clang format

src/main.c

@@ -69,9 +69,14 @@ int main(int argc, char **argv)
         // Execute AST
         return_code = execution(command_ast);
 
+        ast_free(&command_ast);
+
         // Retrieve and build next AST
         command_ast = get_ast();
     }
+
+    ast_free(&command_ast);
+
     if (command_ast == NULL)
         return ERR_INPUT_PROCESSING;