How To Fix Return Type Of A Function

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***Fix the return type of a function in order to avoid errors.


function sum(int $x, int $y, int $z):int {
    return $x+$y+$z;
echo sum(5,5,5);

function txt( string $fname, string $lname):string {
    return $fname.' '.$lname;
 echo txt('Sherlock','Holmes');?>
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Nahid Mahamud

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