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$s1 = 'ATGGTAC';   
$s2 =       'CCGTAATG';
...
$result12 = merged_function($s1,$2);

# Should return: "ATGGTACCGTAATG'

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$s1 = 'CCGTAATG';
$s2 =      'ATGGTAC';   
...
$result12 = merged_function($s1,$2);

# Should return: "CCGTAATGGTAC'