Function fee_rate_to_absolute 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn fee_rate_to_absolute(
    fee_rate: *const c_char,
    weight: *const c_char,
) -> *mut c_char

Converts a given fee_rate (in sats/vbyte) to absolute fee (in sats); given some transaction weight.

• 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.