Update all new Tasks

Task/Generate-lower-case-ASCII-alphabet/D/generate-lower-case-ascii-alphabet-1.d

@@ -0,0 +1,3 @@
+import std.ascii: lowercase;
+
+void main() {}

Task/Generate-lower-case-ASCII-alphabet/D/generate-lower-case-ascii-alphabet-2.d

@@ -0,0 +1,6 @@
+void main() {
+    char['z' - 'a' + 1] arr;
+
+    foreach (immutable i, ref c; arr)
+        c = 'a' + i;
+}

Task/Generate-lower-case-ASCII-alphabet/D/generate-lower-case-ascii-alphabet-3.d

@@ -0,0 +1,5 @@
+void main() {
+    import std.range, std.algorithm, std.array;
+
+    char[26] arr = 26.iota.map!(i => cast(char)('a' + i)).array;
+}

Task/Generate-lower-case-ASCII-alphabet/D/generate-lower-case-ascii-alphabet-4.d

@@ -0,0 +1,8 @@
+void main() {
+    char[] arr;
+
+    foreach (immutable char c; 'a' .. 'z' + 1)
+        arr ~= c;
+
+    assert(arr == "abcdefghijklmnopqrstuvwxyz");
+}