The MinimumConjugate(s) command computes, efficiently, the lexicographically least conjugate of the word (string) s. The conjugates of a word are its cyclic permutations.

All of the StringTools package commands treat strings as (null-terminated) sequences of $8$-bit (ASCII) characters.  Thus, there is no support for multibyte character encodings, such as unicode encodings.

$\mathrm{with}\left(\mathrm{StringTools}\right)\:$

$\mathrm{MinimumConjugate}\left(''abc''\right)$

$''abc''$

$\mathrm{MinimumConjugate}\left(''bca''\right)$

$''abc''$

$\mathrm{MinimumConjugate}\left(''bac''\right)$

$''acb''$