Try changing this:
add_filter( ‘the_title’, ‘myfunction’);
to this:
add_filter( 'the_title', 'myfunction' );
(If this is indeed your problem it is likely an issue of copy/pasting code from a tutorial with curly quotes in place of standard single-quote marks.)
p.s. prefix your function name with your Plugin slug. “myfunction” is far too generic.
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