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if( length($string) > 0 ) {
  # do something
}

if( length($string) > 50 ) {
  # cut the string and either add ... to show it was truncated.
  $string = substr( $string, 0, 47 ) . '...';
  # alternatively, or not
  $string = substr( $string, 0, 50 );
}

my $MAXLEN = 50;
if( length($string) > $MAXLEN ) {
  # cut the string and either add ... to show it was truncated.
...
  # alternatively, or not
  $string = substr( $string, 0, $MAXLEN );
}