decrypt (cloze)

static public String decrypt(String inputString) {
    var length = /* how many characters in the input string? */
    var sb = new StringBuffer(length);
    sb.setLength(length);
    var m = /* length of the first section */
    var offset = /* start of the first section */;
    var distance = /* how far away are the chars to be put?  */;
    while (/* is there still work to be done */) {
        var substr = /* get the section for this run */
        var x = /* first index of an empty index in sb */
        for (/* each char in this section */) {
            char chr = /* the character */
            sb.setCharAt(/* ??? */);
            x += distance;
        }
        /*  update these values:
            distance
            offset
            m
         */
    }
    return sb.toString();
}