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Returns a centered copy of +self+.
If integer argument +size+ is greater than the size (in characters) of +self+,
returns a new string of length +size+ that is a copy of +self+,
centered and padded on both ends with +pad_string+:
'hello'.center(10) # => " hello "
' hello'.center(10) # => " hello "
'hello'.center(10, 'ab') # => "abhelloaba"
'тест'.center(10) # => " тест "
'こんにちは'.center(10) # => " こんにちは "
If +size+ is not greater than the size of +self+, returns a copy of +self+:
'hello'.center(5) # => "hello"
'hello'.center(1) # => "hello"
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