fix: prevent underflow in array_pop when called on an empty array

src/dynamic_array.h

@@ -63,6 +63,9 @@ typedef struct {
 #define array_pop(arr)                                  \
     do {                                                \
         ArrayHeader *header = array_get_header(arr);    \
+        if (header->size == 0) {                        \
+            break;                                      \
+        }                                               \
         header->size--;                                 \
     } while (0)