Insert space for additional async exercises

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diff --git a/exercises/099_formatting.zig b/exercises/099_formatting.zig
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-//
-// Terminals have come a long way over the years. Starting with
-// monochrome lines on flickering CRT monitors and continuously
-// improving to today's modern terminal emulators with sharp
-// images, true color, fonts, ligatures, and characters in every
-// known language.
-//
-// Formatting our results to be appealing and allow quick visual
-// comprehension of the information is what users desire. <3
-//
-// C set string formatting standards over the years, and Zig is
-// following suit and growing daily. Due to this growth, there is
-// no official documentation for standard library features such
-// as string formatting.
-//
-// Therefore, the comments for the format() function are the only
-// way to definitively learn how to format strings in Zig:
-//
-//     https://codeberg.org/ziglang/zig/src/branch/master/lib/std/Io/Writer.zig#L537
-//
-// Zig already has a very nice selection of formatting options.
-// These can be used in different ways, but generally to convert
-// numerical values into various text representations. The results
-// can be used for direct output to a terminal or stored for
-// later use or written to a file. The latter is useful when
-// large amounts of data are to be processed by other programs.
-//
-// In Ziglings, we are concerned with the output to the console.
-// But since the formatting instructions for files are the same,
-// what you learn applies universally.
-//
-// Since we write to "debug" output in Ziglings, our answers
-// usually look something like this:
-//
-//      print("Text {placeholder} another text \n", .{foo});
-//
-// In addition to being replaced with foo in this example, the
-// {placeholder} in the string can also have formatting applied.
-// How does that work?
-//
-// This actually happens in several stages. In one stage, escape
-// sequences are evaluated. The one we've seen the most
-// (including the example above) is "\n" which means "line feed".
-// Whenever this statement is found, a new line is started in the
-// output. Escape sequences can also be written one after the
-// other, e.g. "\n\n" will cause two line feeds.
-//
-// By the way, the result of these escape sequences is passed
-// directly to the terminal program. Other than translating them
-// into control codes, escape sequences have nothing to do with
-// Zig. Zig knows nothing about "line feeds" or "tabs" or
-// "bells".
-//
-// The formatting that Zig *does* perform itself is found in the
-// curly brackets: "{placeholder}". Formatting instructions in
-// the placeholder will determine how the corresponding value,
-// e.g. foo, is displayed.
-//
-// And this is where it gets exciting, because format() accepts a
-// variety of formatting instructions. It's basically a tiny
-// language of its own. Here's a numeric example:
-//
-//     print("Catch-0x{x:0>4}.", .{twenty_two});
-//
-// This formatting instruction outputs a hexadecimal number with
-// leading zeros:
-//
-//     Catch-0x0016.
-//
-// Or you can center-align a string like so:
-//
-//     print("{s:*^20}\n", .{"Hello!"});
-//
-// Output:
-//
-//     *******Hello!*******
-//
-// Let's try making use of some formatting. We've decided that
-// the one thing missing from our lives is a multiplication table
-// for all numbers from 1-15. We want the table to be nice and
-// neat, with numbers in straight columns like so:
-//
-//      X |  1   2   3   4   5  ...
-//     ---+---+---+---+---+---+
-//      1 |  1   2   3   4   5
-//
-//      2 |  2   4   6   8  10
-//
-//      3 |  3   6   9  12  15
-//
-//      4 |  4   8  12  16  20
-//
-//      5 |  5  10  15  20  25
-//
-//      ...
-//
-// Without string formatting, this would be a more challenging
-// assignment because the number of digits in the numbers varies
-// from 1 to 3. But formatting can help us with that.
-//
-const std = @import("std");
-const print = std.debug.print;
-
-pub fn main() !void {
-    // Max number to multiply
-    const size = 15;
-
-    // Print the header:
-    //
-    // We start with a single 'X' for the diagonal.
-    print("\n X |", .{});
-
-    // Header row with all numbers from 1 to size.
-    for (0..size) |n| {
-        print("{d:>3} ", .{n + 1});
-    }
-    print("\n", .{});
-
-    // Header column rule line.
-    var n: u8 = 0;
-    while (n <= size) : (n += 1) {
-        print("---+", .{});
-    }
-    print("\n", .{});
-
-    // Now the actual table. (Is there anything more beautiful
-    // than a well-formatted table?)
-    for (0..size) |a| {
-        print("{d:>2} |", .{a + 1});
-
-        for (0..size) |b| {
-            // What formatting is needed here to make our columns
-            // nice and straight?
-            print("{???} ", .{(a + 1) * (b + 1)});
-        }
-
-        // After each row we use double line feed:
-        print("\n\n", .{});
-    }
-}