In C:

$560564\mathrm{.}3630412.$qx$3$zqy$7$

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Given strings userName and lastName, append a comma to userName. Then, append lastName to userName.

Ex: If the input is Taj King, then the output is:

Taj,KingGiven strings userName and lastName, append a comma to userName. Then, append lastName to userName.

Ex: If the input is Taj King, then the output is:

Taj,King