Fix memory leak in Ground REPL, remove persistent labels to avoid UB

.gitignore

@@ -3,3 +3,4 @@ build
 ground
 groundc
 .idea
+Makefile

src/repl.c

@@ -1,5 +1,5 @@
 /*
- * Ground REPL (when ground is ran without any arguments)
+ * Ground REPL (shows when ground is ran without any arguments)
  * Copyright (C) 2026 DiamondNether90
  * 
  * This program is free software: you can redistribute it and/or modify
@@ -36,6 +36,7 @@ int repl() {
     scope.isMainScope = true;
     while (true) {
         Estr programString = CREATE_ESTR("");
+        *scope.labels = NULL;
         
         // Get program
         printf(">>> ");
@@ -52,6 +53,7 @@ int repl() {
         GroundProgram program = createGroundProgram();
         program = parseFile(programString.str);
         interpretGroundProgram(&program, &scope);
+        freeGroundProgram(&program);
         
         DESTROY_ESTR(programString);
     }