How to append string to file without new line break using storage laravel?

trying to add strings in a file on the same line using Storage::disk('local')->append() method but in the output file i'm getting each strings on new line

what i did is:

$string = "first-"; 
Storage::disk('local')->append('filename', $string);
$string = "second"; 
Storage::disk('local')->append('filename', $string);

and the output file was

first-
second

but i'm trying to get the file without line breaks like

first-second

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