AzizEmir / Rust-Fibonacci-Bigint

sayi_n_eksi_bir == F1 // Starting with 1 but that will be n-1 in first loop sayi_n=2 sayi_n_eksi_bir=1
sayi_n == F2

let mut sayi_n_eksi_bir: BigUint = One::one();
let mut sayi_n: BigUint = One::one();