The Fill procedure generates a filled string from a specified length and fill character. The first argument is a fill character (a Maple string of length equal to one) used to produce the string. The second argument is the length of the string to generate; it must be a 32-bit integer.

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.

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

$s≔\mathrm{Fill}\left(''''\,10\right)$

$s≔''''$

$\mathrm{length}\left(s\right)$

$10$

$\mathrm{Fill}\left(''a''\,0\right)$

$\mathrm{Fill}\left(''a''\,5\right)$

$''aaaaa''$