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If integer is greater than the length of str, returns a new String of length integer with str left justified and padded with padstr; otherwise, returns str.
"hello".ljust(4)            #=> "hello"
"hello".ljust(20)           #=> "hello               "
"hello".ljust(20, '1234')   #=> "hello123412341234123"
               static VALUE
rb_str_ljust(int argc, VALUE *argv, VALUE str)
    return rb_str_justify(argc, argv, str, 'l');

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