Add utility method to Base32 to validate chars

src/ch/epfl/chacun/Base32.java

@@ -25,7 +25,17 @@ public class Base32 {
      * @return true if and only if the string is valid and false otherwise
      */
     public static boolean isValid(String string) {
-        return string.chars().allMatch(c -> ALPHABET.indexOf(c) != -1);
+        return string.chars().allMatch(c -> isValid((char) c));
+    }
+
+    /**
+     * Checks if the given character is valid in base 32.
+     *
+     * @param character the character to be checked
+     * @return true if and only if the character is valid and false otherwise
+     */
+    public static boolean isValid(char character) {
+        return ALPHABET.indexOf(character) != -1;
     }
 
     /**

src/ch/epfl/chacun/gui/ActionUI.java

@@ -81,7 +81,7 @@ public static Node create(ObservableValue<List<String>> actionsO, Consumer<Strin
     private static String sanitizeInput(String input) {
         StringBuilder sanitizedInput = new StringBuilder();
         for (char character : input.toUpperCase().toCharArray()) {
-            if (Base32.ALPHABET.indexOf(character) != -1)
+            if (Base32.isValid(character))
                 sanitizedInput.append(character);
         }
         return sanitizedInput.toString();