public String canonicalizeGroupName(String groupName) {
        return canonicalize(groupName, groupNames);
    }
Canonicalizes the given group name according to whether group names are
case-sensitive under this case sensitivity setting. This function is
equivalent to manually invoking {@link #canonicalize(java.lang.String, boolean)}
with the value of {@link #caseSensitiveGroupNames()}.

@param groupName
    The group name to canonicalize.

@return
    The given group name, transformed as necessary to ensure that
    verbatim string comparisons are consistent with the case sensitivity
    setting for group names.
guacamole-ext/src/main/java/org/apache/guacamole/properties/CaseSensitivity.java