Fix compile warning for gcc-14 + Clean application wrap code

Fix compile warning for gcc-14 + Clean application wrap code

1. Let we use memcpy instead of strncpy, to remove [-Wstringop-truncation]
 - Since we can assume that last string is null-terminated, we can skip this warning

2. Remove duplicated codes, and use GenerationArgV for application constuctors.

3. Remove some possible cases to nullptr constructor for std::string

Change-Id: I22baee82bae05fcc4087431730c6386fa74f52b2
Signed-off-by: Eunki Hong <eunkiki.hong@samsung.com>