Added Documentation

Added Test Cases
Added Comments

core/tests/helpers/hand_encoder.rs

@@ -0,0 +1,40 @@
+pub struct HandEncoder;
+
+impl HandEncoder {
+    pub fn encode_to_meerkat(hand: &[u8]) -> Vec<String> {
+        hand.iter().map(|&card| Self::print_card(card)).collect()
+    }
+
+    pub fn encode_to_steve_brecher(hand: &[u8]) -> u64 {
+        let mut result = 0;
+        for &card in hand.iter() {
+            result |= 0x1 << ((card % 4) * 13 + (card / 4));
+        }
+        result
+    }
+
+    pub fn print_card(card: u8) -> String {
+        if card == 255 {
+            return "-".to_string();
+        }
+        let rank = card / 4;
+        let suit = card % 4;
+        let rank_str = match rank {
+            0..=7 => (rank + 2).to_string(),
+            8 => "T".to_string(),
+            9 => "J".to_string(),
+            10 => "Q".to_string(),
+            11 => "K".to_string(),
+            12 => "A".to_string(),
+            _ => "?".to_string(),
+        };
+        let suit_str = match suit {
+            0 => "c",
+            1 => "d",
+            2 => "s",
+            3 => "h",
+            _ => "?",
+        };
+        format!("{}{}", rank_str, suit_str)
+    }
+}