Function realloc

stdlib/c/stdlib.c:25–45

make our own realloc function

// make our own realloc function
void* realloc(void* ptr, size_t new_size) {
    if (ptr == NULL) {
        return malloc(new_size);
    }

    // You need to keep track of the old size to properly copy the data
    int old_size = ptrsize(ptr);
    
    void* new_ptr = malloc(new_size);
    if (new_ptr == NULL) {
        return NULL; // Allocation failed
    }

    // Copy the old data to the new location
    memcpy(new_ptr, ptr, old_size < new_size ? old_size : new_size);

    // Free the old location
    free(ptr);

    return new_ptr;
}

// A simple implementation of atoi
int atoi(const char* str) {