Update ast interface

v0/ast.h

@@ -11,7 +11,7 @@
 
 typedef struct {
     /** @brief The name of the module being imported. */
-    Token module_name;
+    const char* module_name;
 
     /** @brief Whether the import is public or not. */
     bool is_public;
@@ -53,7 +53,7 @@ struct TypeExpression{
  */
 typedef struct {
     /** @brief The name of the alias. */
-    Token name;
+    const char* name;
 
     /** @brief The value of the alias. */
     TypeExpression value;
@@ -65,7 +65,7 @@ typedef struct {
  */
 typedef struct {
     /** @brief The name of the module. */
-    Token name;
+    const char* name;
 
     /** @brief The list of imports in the module. */
     ImportDeclaration* imports;