fixed bug related to variables

.gitignore

@@ -0,0 +1,2 @@
+labubu
+a.out

labubu.c

@@ -286,17 +286,22 @@ labubu_ast* reduce (labubu_ast* ast, labubu_variables* env) {
 			res = lookup(
 					env, 
 					ast->data.AST_VARIABLE.name);
-			if (res.found) {
-				if (res.value == NULL) return ast;
-				return reduce(res.value, env);
-			}
 
-			return ast;
+
+			if (res.found && res.value != NULL) {
+				if (res.value->tag == AST_VARIABLE)
+					return reduce(res.value, env);
+				else return res.value;
+			}	
+
+			labubu_ast* ast1 = malloc(sizeof (labubu_ast));
+			*ast1 = *ast;
+			return ast1;
 		case AST_APPLICATION:
-			f = reduce(ast->data.AST_APPLICATION.f, env); 
-
 			v = reduce(ast->data.AST_APPLICATION.v, env); 
 
+			f = reduce(ast->data.AST_APPLICATION.f, env); 
+
 			if (f->tag == AST_FUNCTION) {
 				push(env, f->data.AST_FUNCTION.lambda, v);
 
@@ -322,7 +327,7 @@ labubu_ast* reduce (labubu_ast* ast, labubu_variables* env) {
 int main (void) {
 	labubu_lexer lexer = {
 		.tokens = malloc(1024 * sizeof (labubu_token)),
-		.rest = "((\\a.\\b.((a b) \\x.\\y.y) \\x.\\y.x) \\x.\\y.x)"
+		.rest = "((\\a.\\b.((a b) \\x.\\y.y) \\x.\\y.y) \\x.\\y.x)"
 	};
 	printf("%s = ", lexer.rest);
 	tokenize(&lexer);