void insertElement(HashTable* htable, const Key key, const Value value)
{
	int hashedIndex = hash(key, getSize(htable)), i = 1;

	while (htable->table[hashedIndex].key != UNUSED) {
		hashedIndex = hash(key + i, getSize(htable));
		i++;
	}

	htable->table[hashedIndex].key = key;
	htable->table[hashedIndex].value = value;

	// Postcondition: det finns ett element for key i tabellen (anvand lookup() for att verifiera)
	assert(lookup(htable, key)->personalNumber == value.personalNumber);

}