Avoid use toString() or substring()in favor of a simplified expression. (#126)

Author: arturobernalg

src/main/java/org/apache/commons/codec/language/DoubleMetaphone.java

@@ -972,7 +972,7 @@ public void appendPrimary(final String value) {
             if (value.length() <= addChars) {
                 this.primary.append(value);
             } else {
-                this.primary.append(value.substring(0, addChars));
+                this.primary.append(value, 0, addChars);
             }
         }
 
@@ -981,7 +981,7 @@ public void appendAlternate(final String value) {
             if (value.length() <= addChars) {
                 this.alternate.append(value);
             } else {
-                this.alternate.append(value.substring(0, addChars));
+                this.alternate.append(value, 0, addChars);
             }
         }
 

src/main/java/org/apache/commons/codec/language/bm/PhoneticEngine.java

@@ -403,7 +403,7 @@ public String encode(String input, final Languages.LanguageSet languageSet) {
         input = input.toLowerCase(Locale.ENGLISH).replace('-', ' ').trim();
 
         if (this.nameType == NameType.GENERIC) {
-            if (input.length() >= 2 && input.substring(0, 2).equals("d'")) { // check for d'
+            if (input.length() >= 2 && input.startsWith("d'")) { // check for d'
                 final String remainder = input.substring(2);
                 final String combined = "d" + remainder;
                 return "(" + encode(remainder) + ")-(" + encode(combined) + ")";