Function btck_block_get_header 

pub unsafe extern "C" fn btck_block_get_header(
    block: *const btck_Block,
) -> *mut btck_BlockHeader

@brief Get the btck_BlockHeader from the block.

Creates a new btck_BlockHeader object from the block’s header data.

@param[in] block Non-null btck_Block @return btck_BlockHeader.