add: added projectsHEADmain

1 files changed, 27 insertions, 0 deletions

diff --git a/21sh/ll-expr/src/ast/ast.c b/21sh/ll-expr/src/ast/ast.c
new file mode 100644
index 0000000..701d40e
--- /dev/null
+++ b/21sh/ll-expr/src/ast/ast.c
@@ -0,0 +1,27 @@
+#include "ast.h"
+
+#include <err.h>
+#include <stdlib.h>
+
+struct ast *ast_new(enum ast_type type)
+{
+    struct ast *new = calloc(1, sizeof(struct ast));
+    if (!new)
+        return NULL;
+    new->type = type;
+    return new;
+}
+
+void ast_free(struct ast *ast)
+{
+    if (ast == NULL)
+        return;
+
+    ast_free(ast->left);
+    ast->left = NULL;
+
+    ast_free(ast->right);
+    ast->right = NULL;
+
+    free(ast);
+}