How to remove specific element from an array [duplicate]

Answer 1

Because comments don't allow good code formatting:

At the beginning of your code, you get the String contents as a char[] and immediately lose it again by assigning a new char[] of the same size to the variable.

char[] b = inputString.toCharArray();
b = new char[b.length];

so the loop after works on a default-initialized array, not on the string contents. You need two array references to do the copying.