feat: address review comments

Author: sailok.chinta

src/main/java/com/thealgorithms/conversions/IntegerToEnglish.java

@@ -1,49 +1,13 @@
 package com.thealgorithms.conversions;
 
-import java.util.HashMap;
+import java.util.Map;
 
 public final class IntegerToEnglish {
-    private static final HashMap<Integer, String> BASE_NUMBERS_MAP = new HashMap<>() {
-        {
-            put(0, "");
-            put(1, "One");
-            put(2, "Two");
-            put(3, "Three");
-            put(4, "Four");
-            put(5, "Five");
-            put(6, "Six");
-            put(7, "Seven");
-            put(8, "Eight");
-            put(9, "Nine");
-            put(10, "Ten");
-            put(11, "Eleven");
-            put(12, "Twelve");
-            put(13, "Thirteen");
-            put(14, "Fourteen");
-            put(15, "Fifteen");
-            put(16, "Sixteen");
-            put(17, "Seventeen");
-            put(18, "Eighteen");
-            put(19, "Nineteen");
-            put(20, "Twenty");
-            put(30, "Thirty");
-            put(40, "Forty");
-            put(50, "Fifty");
-            put(60, "Sixty");
-            put(70, "Seventy");
-            put(80, "Eighty");
-            put(90, "Ninety");
-            put(100, "Hundred");
-        }
-    };
+    private static final Map<Integer, String> BASE_NUMBERS_MAP = Map.ofEntries(Map.entry(0, ""), Map.entry(1, "One"), Map.entry(2, "Two"), Map.entry(3, "Three"), Map.entry(4, "Four"), Map.entry(5, "Five"), Map.entry(6, "Six"), Map.entry(7, "Seven"), Map.entry(8, "Eight"), Map.entry(9, "Nine"),
+        Map.entry(10, "Ten"), Map.entry(11, "Eleven"), Map.entry(12, "Twelve"), Map.entry(13, "Thirteen"), Map.entry(14, "Fourteen"), Map.entry(15, "Fifteen"), Map.entry(16, "Sixteen"), Map.entry(17, "Seventeen"), Map.entry(18, "Eighteen"), Map.entry(19, "Nineteen"), Map.entry(20, "Twenty"),
+        Map.entry(30, "Thirty"), Map.entry(40, "Forty"), Map.entry(50, "Fifty"), Map.entry(60, "Sixty"), Map.entry(70, "Seventy"), Map.entry(80, "Eighty"), Map.entry(90, "Ninety"), Map.entry(100, "Hundred"));
 
-    private static final HashMap<Integer, String> THOUSAND_POWER_MAP = new HashMap<>() {
-        {
-            put(1, "Thousand");
-            put(2, "Million");
-            put(3, "Billion");
-        }
-    };
+    private static final Map<Integer, String> THOUSAND_POWER_MAP = Map.ofEntries(Map.entry(1, "Thousand"), Map.entry(2, "Million"), Map.entry(3, "Billion"));
 
     private IntegerToEnglish() {
     }