- improve string helper - add startsWith() method + fix indentation

src/engine/helper/HL_String.cpp

@@ -348,6 +348,12 @@ std::string StringHelper::decodeUri(const std::string& s)
     return ret;
 }
 
+bool StringHelper::startsWith(const std::string& s, const std::string& prefix)
+{
+    std::string::size_type p = s.find(prefix);
+    return p == 0;
+}
+
 #define XML_HEADER "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>"
 // --------------------- XcapHelper -----------------
 std::string XcapHelper::buildBuddyList(std::string listName, std::vector<std::string> buddies)

src/engine/helper/HL_String.h

@@ -58,6 +58,7 @@ public:
     static std::string replace(const std::string& s, char f, char r);
     static std::string replace(const std::string& s, const std::string& tmpl, const std::string& n);
     static std::string decodeUri(const std::string& s);
+    static bool startsWith(const std::string& s, const std::string& prefix);
 };
 
 class XcapHelper