refactor: executable per day

array_list.h

@@ -23,3 +23,30 @@ void alist_free(array_list *alist);
 #define ADVENT_OF_CODE_2023_ARRAY_LIST_H
 
 #endif //ADVENT_OF_CODE_2023_ARRAY_LIST_H
+
+//#define ARRAY_LIST_IMPLEMENTATION
+#ifdef ARRAY_LIST_IMPLEMENTATION
+
+array_list* alist_create(int capacity) {
+    array_list *alist = malloc(sizeof (struct array_list_struct));
+    alist->data = malloc(sizeof (ELEMENT_TYPE) * capacity);
+    alist->capacity = capacity;
+    alist->length = 0;
+    return alist;
+}
+
+void alist_add(array_list *alist, ELEMENT_TYPE entry) {
+    if(alist->length >= alist->capacity) {
+        alist->data = realloc(alist->data, alist->capacity * 2);
+        alist->capacity = alist->capacity * 2;
+    }
+
+    alist->data[alist->length++] = entry;
+}
+
+void alist_free(array_list *alist) {
+    free(alist->data);
+    free(alist);
+}
+
+#endif //ARRAY_LIST_IMPLEMENTATION