Function estimate_network_fee 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn estimate_network_fee(
    network: *const c_char,
    node_address: *const c_char,
    conf_target: *const c_char,
) -> *mut c_char

Gets the current network fee (in sats/vbyte) for a given confirmation target.

• OUTPUT

 NetworkFee {
   rate: f32,
   absolute: Option<u64>,
 }

Safety

• This function is unsafe because it dereferences and a returns raw pointer.
• ENSURE that result is passed into cstring_free(ptr: *mut c_char) after use.