Data commit

Task/Character-codes/D/character-codes.d

@@ -0,0 +1,12 @@
+void main() {
+    import std.stdio, std.utf;
+
+    string test = "a";
+    size_t index = 0;
+
+    // Get four-byte utf32 value for index 0.
+    writefln("%d", test.decode(index));
+
+    // 'index' has moved to next character input position.
+    assert(index == 1);
+}