Remove unnecessary code (#4141)

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

@@ -175,7 +175,7 @@ public class AnyBaseToAnyBase {
             // If the remainder is a digit < 10, simply add it to
             // the left side of the new number.
             if (decimalValue % b2 < 10) {
-                output = Integer.toString(decimalValue % b2) + output;
+                output = decimalValue % b2 + output;
             } // If the remainder is >= 10, add a character with the
             // corresponding value to the new number. (A = 10, B = 11, C = 12, ...)
             else {