String$-1>$ hello$\_$name

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Given a string name, e$.$g$.$ "Bob", return a greeting of the form "Hello Bob!".

hello$\_$name$(\text{'}$Bob$\text{'})->$ 'Hello Bob!$\text{'}$

hello$\_$name$(\text{'}$Alice$\text{'})->$ 'Hello Alice!$\text{'}$

hello$\_$name$(\text{'}$X$\text{'})->$ 'Hello X$!\text{'}$