feat: implement first task as file

src/tasks/mod.rs

@@ -0,0 +1 @@
+mod tasks01;

src/tasks/tasks01/block2poly.rs

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+use crate::utils::poly;
+use base64::prelude::*;
+
+fn block2poly(block: String) {
+    let num_block: u128 = BASE64_STANDARD.decode(block).unwrap().into();
+    let coefficients = poly::get_bit_indices_from_byte();
+}

src/tasks/tasks01/mod.rs

@@ -0,0 +1,2 @@
+mod poly2block;
+mod block2poly;

src/tasks/tasks01/poly2block.rs

@@ -0,0 +1,7 @@
+use crate::utils::poly::{self, coefficient_to_binary};
+use base64::prelude::*;
+use serde_json::Value;
+
+pub fn poly2block(coefficients: Vec<u8>) -> String {
+    BASE64_STANDARD.encode(poly::coefficient_to_binary(coefficients).to_ne_bytes())
+}