char $*$zip$($char $*$a$,$ char $*$b$)\{$

char $*$result;

int len, i;

len $=$ strlen$($a$)$;

result $=$ malloc$(2*$ len$)$;

for $($i $=0$; i $<$ len; i$++)\{$

result$[2*$ i$]=$ a$[$i$]$;

result$[2*$ i $+1]=$ b$[$i$]$;

$\}$

return result;

$\}$

int main$()\{$

char $*$a $="..."$;

char $*$b $="..."$;

char $*$merged $=$ zip$($a$,$ b$)$;

printf$("$Merged string: $\%$s

$",$ merged$)$;

return $0$;

$\}$

A$.$ Is this function implemented securely$?$ Give an explanation.