#[unsafe(no_mangle)]pub unsafe extern "C" fn dc_block_contact(
context: *mut dc_context_t,
contact_id: u32,
block: c_int,
)#[unsafe(no_mangle)]pub unsafe extern "C" fn dc_block_contact(
context: *mut dc_context_t,
contact_id: u32,
block: c_int,
)