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Idiom #214 Pad string on the right

Append extra character c at the end of string s to make sure its length is at least m.
The length is the number of characters, not the number of bytes.

LazUtf8
s := UTF8PadRight(s,m,c);
That's automatically the way strings are handled, as specified by the Fortran language standard.
CHARACTER(N) ::  FOO
import "strings"
import "utf8"
if n := utf8.RuneCountInString(s); n < m {
	s += strings.Repeat(c, m-n)
}
s = s.ljust(m, c)
s = s.ljust(m, c)
s = s.ljust(m, c)

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