[BUG] dynarray_push() doubles capacity twice causing memory waste

[seesee010]

Bug Description

When dynarray_push() needs to resize, it increases capacity twice: once via dynarray_inc() and again by multiplying capacity by itself.

Location

src/modify.c lines 112-119

Current Code

if (array->length >= array->capacity) {
    isOk = dynarray_inc(array, array->capacity);  // capacity: 2 → 4
    
    if (!isOk) {
        return false;
    }

    array->capacity *= array->capacity;  // capacity: 4 → 16 !!
}

Problem

1. dynarray_inc(array, array->capacity) already doubles the capacity
2. Then multiplying again causes exponential growth: 2 → 4 → 16 → 256 → 65536!
3. Wastes massive amounts of memory

Expected Behavior

Should double capacity once: 2 → 4 → 8 → 16 → 32

Proposed Fix

if (array->length >= array->capacity) {
    size_t new_capacity = array->capacity == 0 ? 1 : array->capacity * 2;
    if (!dynarray_setSize(array, new_capacity)) {
        return false;
    }
}

Impact

• Severity: High
• Memory waste (16x more than needed after first resize)
• Performance impact from unnecessary reallocations

Reproduction

DynArray *arr = dynarray_create(sizeof(int), 2);
printf("Initial capacity: %zu\n", dynarray_capacity(arr));  // 2

int val = 10;
dynarray_push(arr, &val);
dynarray_push(arr, &val);
dynarray_push(arr, &val);  // Triggers resize

printf("After resize: %zu\n", dynarray_capacity(arr));  // Shows 16 instead of 4!