This it should be a bug. Try to pass '101' and it return 3 instead of 5 because of this line.

[Savimbi]

Data-Structures-and-Algorithms-in-Java/src/main/java/com/packt/datastructuresandalg/lesson1/binarytodecimal/BinaryToDecimal.java

Line 10 in 0ad5788

conversion *= 2;