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Warning: session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in /var/www/tb-usercake/models/config.php on line 51
public static S joinChars(Collection l) { int n = l(l); char[] a = new char[n]; int i = 0; for (char c : unnull(l)) a[i++] = c; ret str(a); }