Moved exercises to exercises because exercises

23_errors3.zig

@@ -1,28 +0,0 @@
-//
-// One way to deal with error unions is to "catch" any error and
-// replace it with a default value.
-//
-//     foo = canFail() catch 6;
-//
-// If canFail() fails, foo will equal 6.
-//
-const std = @import("std");
-
-const MyNumberError = error{ TooSmall };
-
-pub fn main() void {
-    var a: u32 = addTwenty(44) catch 22;
-    var b: u32 = addTwenty(4)  ???   22;
-
-    std.debug.print("a={}, b={}", .{a,b});
-}
-
-// Please provide the return type from this function.
-// Hint: it'll be an error union.
-fn addTwenty(n: u32) ??? {
-    if (n < 5) {
-        return MyNumberError.TooSmall;
-    } else {
-        return n + 20;
-    }
-}