Attempt to free stdout memory

zig/sdl/hello_sdl.zig

    var pos: usize = 0;
    var max_chars = std.math.min(@divTrunc(@intCast(usize, window_width), @intCast(usize, glyph_width)), msg.len);
    var result: []const u8 = "";
    var result: []const u8 = try gpa.alloc(u8, 0);
    const keyboardState = c.SDL_GetKeyboardState(null);
                                msg[pos] = '_';
                            },
                            c.SDLK_RETURN => {
                                gpa.free(result);
                                result = try runCommand(&msg, gpa);
                                var i: usize = 0;
                                while (i < max_chars) : (i += 1) {
        c.SDL_Delay(16);
    }
    _ = general_purpose_allocator.detectLeaks();
}
fn runCommand(raw_cmd: []const u8, allocator: *std.mem.Allocator) ![]const u8 {