Rename AST structures to Tree and relocate freeing logic

v0/ast/module.c

@@ -0,0 +1,43 @@
+#include "module.h"
+#include "expression.h"
+#include <stdlib.h>
+
+void ast_free_type(TypeTree* type);
+
+void ast_free_module(ModuleTree* module) {
+    if (module == NULL) {
+        return;
+    }
+
+    if (module->imports != NULL) {
+        for(size_t i = 0; i < module->import_count; i++) {
+            free(module->imports[i].module_name);
+        }
+        free(module->imports);
+    }
+    
+    if (module->aliases != NULL) {
+        for(size_t i = 0; i < module->alias_count; i++) {
+            free((void*)module->aliases[i].name);
+            ast_free_type(&module->aliases[i].value);
+        }
+        free(module->aliases);
+    }
+
+    if (module->variables != NULL) {
+        for(size_t i = 0; i < module->variable_count; i++) {
+            free(module->variables[i].name);
+            ast_free_type(&module->variables[i].type);
+            if (module->variables[i].initializer) {
+                if (module->variables[i].initializer->tag == EXPRESSION_TREE_STRING) {
+                    free((void*)module->variables[i].initializer->string);
+                }
+                free(module->variables[i].initializer);
+            }
+        }
+        free(module->variables);
+    }
+
+    free(module->name);
+    free(module);
+}