Cannot modify header information error w/in Dashboard

When I install my theme I get this error at the top of every page in the Dashboard. Also, if I try to make a post or page it works, but it sends me to a blank page with this error message:

Warning: Cannot modify header information – headers already sent by (output started at /home/lwebdesi/public_html/blog/wp-content/themes/azuree/functions.php:52) in /home/lwebdesi/public_html/blog/wp-includes/functions.php on line 861

Warning: Cannot modify header information – headers already sent by (output started at /home/lwebdesi/public_html/blog/wp-content/themes/azuree/functions.php:52) in /home/lwebdesi/public_html/blog/wp-includes/functions.php on line 862

This is my entire functions.php:

[Code moderated as per the Forum Rules. Please use the pastebin]

Is there anything wrong with it? I’m not very good at php :/.