bingbong

module bingbong; private:

import std.range;
import std.random;
import std.stdio;
import std.string;
import std.conv;
import std.uni;

enum formats = [
    "*%s*",
    "**%s**",
    "***%s***",
    "~~%s~~",
    "__%s__",
    "__*%s*__",
    "__**%s**__",
    "__***%s***__",
    "`%s`",
    null,
];

bool coinFlip()
{
    return uniform!"[]"( 1, 100 ) <= 50;
}

ElementType!R sample( R )( R r ) if( isRandomAccessRange!R && hasLength!R )
{
    auto index = uniform( 0, r.length );
    return r[index];
}

void main()
{
    auto text = "?";
    auto count = 100;

    string output;
    auto i = 0u;
    foreach( c; text.cycle )
    {
        if( i++ >= count * text.length )
            break;

        auto fmt = formats.sample;
        auto chr = coinFlip ? c.to!( string ).toUpper() : c.to!string;

        output ~= ( fmt is null ? chr : fmt.format( chr ) ) ~ ' ';
    }

    output.writeln();
}