cconcat is one of many commands within the Tclx package.
cconcat ?string1? ?string2? ?...?
Concatenate the arguments, returning the resulting string.
While string concatenation is normally performed by the
parser, it is occasionally useful to have a command that
returns a string. The is generally useful when a command to
evaluate is required. No separators are inserted between
the strings.
This command is UTF-aware.