feature: Added structure for ArrayListSlices

include/arraylist.h

@@ -7,15 +7,7 @@
 
 typedef struct ArrayList ArrayList;
 
-// FUCK, i forgot one of the main reasons i wanted to
-// implement arrays myself was because i needed 
-// array slices or something like this and i completely
-// forgot, fuck, guess i will implement it once i get
-// the tests done.
-typedef struct {
-    ArrayList *array;
-    size_t offset;
-} ArrayListSlice;
+typedef struct ArrayListSlice ArrayListSlice;
 
 typedef enum {
     ARRLIST_OK = 0,
@@ -26,6 +18,7 @@ typedef enum {
     ARRLIST_NULL_ARG,
     ARRLIST_INVALID_ELEM_SIZE,
     ARRLIST_INVALID_CAPACITY,
+    ARRLIST_IS_BORROWED,
 } ArrayListErr;
 
 ArrayList *arraylist_init(size_t capacity, size_t elem_size);