removeQuotes minor optim

Author: Stephane Landelle

src/main/java/com/ning/http/util/AsyncHttpProviderUtils.java

@@ -498,7 +498,7 @@ public static Cookie parseCookie(String value) {
     }
 
     public static int convertExpireField(String timestring) {
-        String trimmedTimeString = removeQuote(timestring.trim());
+        String trimmedTimeString = removeQuotes(timestring.trim());
         long now = System.currentTimeMillis();
         Date date = null;
 
@@ -515,13 +515,24 @@ public static int convertExpireField(String timestring) {
             throw new IllegalArgumentException("Not a valid expire field " + trimmedTimeString);
     }
 
-    private final static String removeQuote(String s) {
+    public final static String removeQuotes(String s) {
         if (MiscUtil.isNonEmpty(s)) {
-            if (s.charAt(0) == '"')
-                s = s.substring(1);
+            int start = 0;
+            int end = s.length();
+            boolean changed = false;
 
-            if (s.charAt(s.length() - 1) == '"')
-                s = s.substring(0, s.length() - 1);
+            if (s.charAt(0) == '"') {
+                changed = true;
+                start++;
+            }
+
+            if (s.charAt(s.length() - 1) == '"') {
+                changed = true;
+                end--;
+            }
+
+            if (changed)
+                s = s.substring(start, end);
         }
         return s;
     }