@SuppressWarnings("varargs")
    @SafeVarargs
    public static <T> ToString<T> joining(
            ToString<T>... expressions) {
        return joining("", expressions);
    }
Returns an expression that represents the result of all the specified
expressions joined together, forming a single string.

@param expressions  the array of expressions to join
@param <T>          the input entity type
@return             the joined expression
runtime-parent/runtime-compute/src/main/java/com/speedment/runtime/compute/expression/Expressions.java