add more SampleExtract functions

examples/bomberman.rs

@@ -126,20 +126,20 @@ fn main() {
     let player_0_moves_enc = {
         let c = player_0_enc.unseed::<Vec<Vec<u64>>>().key_switch(0);
         (0..no_of_moves)
-            .map(|i| Coordinates::new(c.extract(2 * i), c.extract(i * 2 + 1)))
+            .map(|i| Coordinates::new(c.extract_at(2 * i), c.extract_at(i * 2 + 1)))
             .collect_vec()
     };
     let player_1_bomb_enc = {
         let c = player_1_enc.unseed::<Vec<Vec<u64>>>().key_switch(1);
-        Coordinates::new(c.extract(0), c.extract(1))
+        Coordinates::new(c.extract_at(0), c.extract_at(1))
     };
     let player_2_bomb_enc = {
         let c = player_2_enc.unseed::<Vec<Vec<u64>>>().key_switch(2);
-        Coordinates::new(c.extract(0), c.extract(1))
+        Coordinates::new(c.extract_at(0), c.extract_at(1))
     };
     let player_3_bomb_enc = {
         let c = player_3_enc.unseed::<Vec<Vec<u64>>>().key_switch(3);
-        Coordinates::new(c.extract(0), c.extract(1))
+        Coordinates::new(c.extract_at(0), c.extract_at(1))
     };
 
     // run the game

examples/meeting_friends.rs

@@ -105,11 +105,14 @@ fn main() {
     // Server parses private inputs from user a and b
     let user_a_location_enc = {
         let c = user_a_enc.unseed::<Vec<Vec<u64>>>().key_switch(0);
-        Location::new(c.extract(0), c.extract(1))
+        Location::new(c.extract_at(0), c.extract_at(1))
     };
     let (user_b_location_enc, user_b_threshold_enc) = {
         let c = user_b_enc.unseed::<Vec<Vec<u64>>>().key_switch(1);
-        (Location::new(c.extract(0), c.extract(1)), c.extract(2))
+        (
+            Location::new(c.extract_at(0), c.extract_at(1)),
+            c.extract_at(2),
+        )
     };
 
     // run the circuit

examples/non_interactive_fheuint8.rs

@@ -50,7 +50,7 @@ fn main() {
     // let now = std::time::Instant::now();
     let (ct_c0_a, ct_c0_b) = {
         let ct = c0_batched_to_send.unseed::<Vec<Vec<u64>>>().key_switch(0);
-        (ct.extract(0), ct.extract(1))
+        (ct.extract_at(0), ct.extract_at(1))
     };
     // println!(
     //     "Time to unseed, key switch, and extract 2 ciphertexts: {:?}",
@@ -60,7 +60,7 @@ fn main() {
     // extract a and b from client1 inputs
     let (ct_c1_a, ct_c1_b) = {
         let ct = c1_batch_to_send.unseed::<Vec<Vec<u64>>>().key_switch(1);
-        (ct.extract(0), ct.extract(1))
+        (ct.extract_at(0), ct.extract_at(1))
     };
 
     let now = std::time::Instant::now();