Optimize string length

include/core/utils/ArrayString.hpp

@@ -9,12 +9,9 @@
 namespace Core {
     template<typename T>
     constexpr int stringLength(const T* c) {
-        int i = 0;
-        while(*c != '\0') {
-            c++;
-            i++;
-        }
-        return i;
+        const T* i = c + 1;
+        while(*(c++) != '\0') {}
+        return static_cast<int>(c - i);
     }
 
     Error readUnicode(c32& u, const char*& s);