#05AB1E , 4 bytes

€'!Ć

I/O as a list of characters.

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Explanation:

€'! '# Prepend a "!"-item before each character in the (implicit) input-list
 Ć # Enclose (append the first character of the list at the end of it)
 # (after which the result is output implicitly)

05AB1E , 4 bytes

€'!Ć

I/O as a list of characters.

Try it online.

Explanation:

€'! '# Prepend a "!"-item before each character in the (implicit) input-list
 Ć # Enclose (append the first character of the list at the end of it)
 # (after which the result is output implicitly)