Add list type, obj_free for compound types, and self-reference guard

- Implement OBJ_LIST with offset-based items array and capacity
- obj_free now releases child allocations (string buffer, list items)
- obj_print detects self-referencing lists to prevent infinite recursion
- Visualizer distinguishes freed blocks (JLANG_NOT_USE) from active ones
- JLANG_free now zeroes payload on release

src/memory/allocator.h

@@ -14,6 +14,7 @@
 #define JLANG_FREE 0
 #define JLANG_HEADER 1
 #define JLANG_PAYLOAD 2
+#define JLANG_NOT_USE 3
 
 /*
     La estructura de Metadata se encarga de almacenar el tamaño del bloque y si
@@ -129,7 +130,7 @@ size_t JLANG_malloc(void *ptr, size_t size) {
   freeHeader->size = size;
   freeHeader->in_use = 1;
 
-  void *payloadPtr = (char *) freeHeader + sizeof(JLANG_metadata);
+  void *payloadPtr = (char *)freeHeader + sizeof(JLANG_metadata);
   return (char *)payloadPtr - allocPtr->memory;
 }
 
@@ -144,6 +145,9 @@ void JLANG_free(void *ptr, size_t blockOffset) {
 
   // Set block as not_used
   blockHeader->in_use = 0;
+
+  // Set to 0 payload
+  memset(blockPtr, 0, blockHeader->size);
 }
 
 /*
@@ -181,16 +185,21 @@ void JLANG_visualize(void *ptr) {
     */
 
     if (currentHeader->size > 0) {
-      byteMapPtr[blockIndex] = JLANG_HEADER;
-      for (int i = 0; i < sizeof(JLANG_metadata); i++) {
-        byteMapPtr[blockIndex + i] = JLANG_HEADER;
-      }
+      if (currentHeader->in_use == 1) {
+        byteMapPtr[blockIndex] = JLANG_HEADER;
+        for (int i = 0; i < sizeof(JLANG_metadata); i++) {
+          byteMapPtr[blockIndex + i] = JLANG_HEADER;
+        }
 
-      /*
-          PAYLOAD
-      */
-      for (int i = 0; i < currentHeader->size; i++) {
-        byteMapPtr[blockIndex + sizeof(JLANG_metadata) + i] = JLANG_PAYLOAD;
+        /*
+            PAYLOAD
+        */
+        for (int i = 0; i < currentHeader->size; i++) {
+          byteMapPtr[blockIndex + sizeof(JLANG_metadata) + i] = JLANG_PAYLOAD;
+        }
+      } else {
+        // Mark all block as JLANG_NOT_USE
+        memset(byteMapPtr + blockIndex, JLANG_NOT_USE, sizeof(JLANG_metadata) + currentHeader->size);
       }
     } else {
       break;
@@ -223,6 +232,9 @@ void JLANG_visualize(void *ptr) {
       case JLANG_FREE:
         printf("\033[32m");
         break;
+      case JLANG_NOT_USE:
+        printf("\033[47;5;224m");
+        break;
       default:
         printf("\033[41m");
         break;