Rework Currency Symbol Parsing (#3628)

* Made currency symbol standardized in Kit 
  * Kits should be in a standardized format.
  * Having monetary rewards in kits should not break based off of a config value oriented around currency display (suffix).
  * Additionally, the dollar sign should be the standard money symbol which works on all servers and should not be tied to the server's individual currency symbol.
  * Note that the server's individual currency symbol will still work but probably should not be used due its volatility.
* Reworked config currency symbol parsing in Settings 
  * Simplifies the number of actions needed to sanitize the input.
  * Now just defaults to `$` if the currency-symbol cannot be parsed.
* Removed symbol-suffixed parsing in NumberUtil#sanitizeCurrencyString

Essentials/src/main/java/com/earth2me/essentials/Kit.java

@@ -162,12 +162,12 @@ public class Kit {
 
             boolean spew = false;
             final boolean allowUnsafe = ess.getSettings().allowUnsafeEnchantments();
-            final boolean currencyIsSuffix = ess.getSettings().isCurrencySymbolSuffixed();
             final List<ItemStack> itemList = new ArrayList<>();
             final List<String> commandQueue = new ArrayList<>();
             final List<String> moneyQueue = new ArrayList<>();
+            final String currencySymbol = ess.getSettings().getCurrencySymbol().isEmpty() ? "$" : ess.getSettings().getCurrencySymbol();
             for (final String kitItem : output.getLines()) {
-                if (!currencyIsSuffix ? kitItem.startsWith(ess.getSettings().getCurrencySymbol()) : kitItem.endsWith(ess.getSettings().getCurrencySymbol())) {
+                if (kitItem.startsWith("$") || kitItem.startsWith(currencySymbol)) {
                     moneyQueue.add(NumberUtil.sanitizeCurrencyString(kitItem, ess));
                     continue;
                 }

Essentials/src/main/java/com/earth2me/essentials/Settings.java

@@ -331,7 +331,7 @@ public class Settings implements net.ess3.api.ISettings {
                 } else if (section.isString(command)) {
                     final String costString = section.getString(command);
                     try {
-                        final double cost = Double.parseDouble(costString.trim().replace(getCurrencySymbol(), "").replaceAll("\\W", ""));
+                        final double cost = Double.parseDouble(costString.trim().replace("$", "").replace(getCurrencySymbol(), "").replaceAll("\\W", ""));
                         newSection.set(command.toLowerCase(Locale.ENGLISH), cost);
                     } catch (final NumberFormatException ex) {
                         ess.getLogger().warning("Invalid command cost for: " + command + " (" + costString + ")");
@@ -650,6 +650,7 @@ public class Settings implements net.ess3.api.ISettings {
         removeEffectsOnHeal = _isRemovingEffectsOnHeal();
         vanishingItemPolicy = _getVanishingItemsPolicy();
         bindingItemPolicy = _getBindingItemsPolicy();
+        currencySymbol = _getCurrencySymbol();
     }
 
     void _lateLoadItemSpawnBlacklist() {
@@ -751,11 +752,20 @@ public class Settings implements net.ess3.api.ISettings {
         return config.getString("locale", "");
     }
 
-    //This method should always only return one character due to the implementation of the calling methods
-    //If you need to use a string currency, for example "coins", use the translation key 'currency'.
+    private String currencySymbol = "$";
+
+    // A valid currency symbol value must be one non-integer character.
+    private String _getCurrencySymbol() {
+        String value = config.getString("currency-symbol", "$").trim();
+        if (value.length() != 1 || value.matches("\\d")) {
+            value = "$";
+        }
+        return value;
+    }
+
     @Override
     public String getCurrencySymbol() {
-        return config.getString("currency-symbol", "$").concat("$").substring(0, 1).replaceAll("[0-9]", "$");
+        return currencySymbol;
     }
 
     @Override

Essentials/src/main/java/com/earth2me/essentials/utils/NumberUtil.java

@@ -92,12 +92,7 @@ public final class NumberUtil {
     }
 
     public static String sanitizeCurrencyString(final String input, final IEssentials ess) {
-        final String symbol = ess.getSettings().getCurrencySymbol();
-        final boolean suffix = ess.getSettings().isCurrencySymbolSuffixed();
-        if (input.contains(symbol)) {
-            return suffix ? input.substring(0, input.indexOf(symbol)) : input.substring(symbol.length());
-        }
-        return input;
+        return input.replace(ess.getSettings().getCurrencySymbol(), "");
     }
 
     public static boolean isInt(final String sInt) {