Redirect (301) for website homepage

If you want to redirect http://www.example.com to http://example.com, you can use this:
RewriteCond %{HTTP_HOST} ^www\.example\.com$
RewriteRule ^/?$ "http\:\/\/example\.com\/" [R=301,L]

- If you want to redirect http://example.com to http://www.example.com, you can use this:
RewriteCond %{HTTP_HOST} !^www.example.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]

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htaccess file code

RewriteEngine On
RewriteCond %{HTTP_HOST} ^sitename.com [NC]
RewriteRule ^(.*)$ http://www.sitename.com/$1 [L,R=301]

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