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 {

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

@@ -34,8 +34,7 @@ public class OctalToDecimal {
     public static int convertOctalToDecimal(String inputOctal) {
         try {
             // Actual conversion of Octal to Decimal:
-            Integer outputDecimal = Integer.parseInt(inputOctal, 8);
-            return outputDecimal;
+            return Integer.parseInt(inputOctal, 8);
         } catch (NumberFormatException ne) {
             // Printing a warning message if the input is not a valid octal
             // number: