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String-1 > atFirst
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Given a string, return a string length 2 made of its first 2 chars. If the string length is less than 2, use '@' for the missing chars.

atFirst("hello") → "he"
atFirst("hi") → "hi"
atFirst("h") → "h@"

...Save, Compile, Run (ctrl-enter)

public String atFirst(String str) { }

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