deck: completed function to create and shuffle a UNO card deck.

- added black as a color in `CardColor` in `types.d.ts`
- separated the values of special cards and wild cards into two arrays named specialValues and wildCardValues, respectively.
- Iterates over each color in the colors array.
  For each color:
  * Iterates over each number value (0 to 9) in the numValues array and adds two cards of that color for each number, except for '0' where only one card is added.
  * Iterates over each special value in the specialValues array and adds two cards of that color for each special value.
  * If the color is 'black', iterates over each wild card value in the wildCardValue array and adds four cards of that color for each wild card value.

backend/uno-game-engine/deck.ts

@@ -1,5 +1,5 @@
 const colors: Array<CardColor> = ['red', 'yellow', 'green', 'blue'];
-const values = [
+const numValues: Array<CardNumbers> = [
     '0',
     '1',
     '2',
@@ -10,12 +10,10 @@ const values = [
     '7',
     '8',
     '9',
-    'skip',
-    'reverse',
-    'draw2',
 ];
-const specialCards = ['wild', 'draw4'];
-const deck = [];
+const specialValues: Array<SpecialCardNames> = ['skip', 'reverse', 'draw2'];
+const wildCardValue: Array<SpecialCardNames> = ['colchange', 'draw4'];
+const deck: Array<UNOCard> = [];
 
 /**    
  * In a standard UNO deck, there are 108 cards. Here's the breakdown:
@@ -41,11 +39,27 @@ const deck = [];
  @returns {Array} deck - An array of 108 UNO cards.
  */
 export function getShuffledCardDeck(): Array<UNOCard> {
-    const deck = [];
-    // todo: Implement the card generation logic
-    // dummy code:
-    // deck.push(makeCard('special', 'wild', 'wild'))
-    // deck.push(makeCard('number', 'red', '0'))
+    const deck: Array<UNOCard> = [];
+
+    colors.forEach((color) => {
+        numValues.forEach((value) => {
+            deck.push(makeCard('number', color, value));
+            if (value !== '0') {
+                deck.push(makeCard('number', color, value));
+            }
+        });
+        specialValues.forEach((value) => {
+            deck.push(makeCard('special', color, value));
+            deck.push(makeCard('special', color, value));
+        });
+        if (color === 'black') {
+            wildCardValue.forEach((value) => {
+                for (let i = 0; i < 4; i++) {
+                    deck.push(makeCard('wild', color, value));
+                }
+            });
+        }
+    });
 
     shuffle(deck);
     return deck;

backend/uno-game-engine/types.d.ts

@@ -1,6 +1,6 @@
 type CardType = 'number' | 'special' | 'wild';
 
-type CardColor = 'red' | 'blue' | 'green' | 'yellow';
+type CardColor = 'red' | 'blue' | 'green' | 'yellow' | 'black';
 
 type SpecialCardNames = 'skip' | 'reverse' | 'draw2' | 'draw4' | 'colchange';
 type CardNumbers = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9';