Thank you for your question on working with Addon domains.
I took a look at your file structure and it looks like although sakuranippon.com is setup through Addon domains it is pointed to the same document root as your main domain name gismyanmar.org.
The directory public_html is the document root (where you want to put your files) for your main domain name. You will want to remove sakuranippon.com from Addon domains and then re-add it. cPanel will automatically create a subfolder in public_html that will be the document root for sakuranippon.com. You can then load site files for gismyanmar.org to public_html and site files for sakuranippon.com to it's document root under public_html.
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