Method takeOwnership

Bcore/src/main/cpp/Dobby/tests/catch.hpp:9607–9614

}

void StringRef::takeOwnership() {
  if (!isOwned()) {
    m_data = new char[m_size + 1];
    memcpy(m_data, m_start, m_size);
    m_data[m_size] = '\0';
    m_start        = m_data;
  }
}
auto StringRef::substr(size_type start, size_type size) const noexcept -> StringRef {
  if (start < m_size)
    return StringRef(m_start + start, size);