CString can construct from a string_view (#3677)

* CString can construct from a string_view

(string_views lack a null terminator)

* Update libs/utils/src/CString.cpp

Co-authored-by: Mathias Agopian <pixelflinger@gmail.com>

libs/utils/src/CString.cpp

@@ -40,7 +40,8 @@ CString::CString(const char* cstr, size_t length) {
         p->length = (size_type)length;
         mCStr = (value_type*)(p + 1);
         // we don't use memcpy here to avoid a call to libc, the generated code is pretty good.
-        std::uninitialized_copy_n(cstr, length + 1, mCStr);
+        std::uninitialized_copy_n(cstr, length, mCStr);
+        mCStr[length] = '\0';
     }
 }