Rename AST structures to Tree and relocate freeing logic

v0/test.c

@@ -14,7 +14,7 @@ static char* s_logOutput = NULL;
 static const char* s_currentTestName = NULL;
 static char* s_testSource = NULL;
 
-static Module* s_currentModule = NULL;
+static ModuleTree* s_currentModule = NULL;
 static TokenStream* s_currentTokenStream = NULL;
 
 void fail(const char* msg) {
@@ -90,7 +90,7 @@ TokenStream* test_get_tokenstream(void) {
     return s_currentTokenStream;
 }
 
-Module* test_get_ast(void) {
+ModuleTree* test_get_ast(void) {
     if (s_currentModule == NULL) {
         s_currentModule = parser_parse(test_get_tokenstream());
     }
@@ -277,7 +277,7 @@ int main(int argc, char** argv) {
 
         // Free AST and TokenStream after each test
         if (s_currentModule) {
-            parser_free(s_currentModule);
+            ast_free_module(s_currentModule);
             s_currentModule = NULL;
         }
         if (s_currentTokenStream) {