fix: memory issues, parser errors and get_ast_if returning always NULL

src/utils/ast/ast_if.c

@@ -19,7 +19,7 @@ struct ast *ast_create_if(struct ast *condition, struct ast *then_clause,
 
 struct ast_if *ast_get_if(struct ast *node)
 {
-    if (node == NULL || node->type == AST_IF)
+    if (node == NULL || node->type != AST_IF)
         return NULL;
     return node->data;
 }