Sanitizer.java

package com.anthonynsimon.algorithms.strings;

public final class Sanitizer {

    public static String sanitize(String str, char[] blacklist) {
        int strLength = str.length();
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < strLength; i++) {
            char currentChar = str.charAt(i);
            if (!charInArray(currentChar, blacklist)) {
                sb.append(currentChar);
            }
        }

        return sb.toString();
    }

    private static boolean charInArray(char c, char[] charArray) {
        for (char currentChar : charArray) {
            if (currentChar == c) {
                return true;
            }
        }
        return false;
    }
}