#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// EXAMPLE FROM POST-LECTURE QUESTIONS - definitely incomplete; might have mistakes

static bool _is_leaf(TreeNode* node) {
    return node -> left == NULL && node -> right == NULL;
}

int main(int argc, char* argv[]) {
    uint8_t input[] = { 'A', '\0', '\0', 'C' };
    TreeNode* root = create_huffman_tree(…);
    assert(root -> left -> character == '\0' );
    assert(root -> left -> frequency == 2 );
    assert(root -> left -> left == NULL );
    assert(root -> left -> right == NULL );
    assert(root -> right -> frequency == 2 );
    assert(root -> right -> left -> character == 'A' );
    assert(root -> right -> right -> character == 'C' );
    write_compressed(root, &writer, input, 4);

    return EXIT_SUCCESS;
}
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