Add tasks for all the new languages

Task/Move-to-front-algorithm/Sidef/move-to-front-algorithm-1.sidef

@@ -0,0 +1,25 @@
+func encode(str) {
+    var table = ('a'..'z' -> join);
+    str.chars.map { |c|
+        var s = '';
+        table.sub!(Regex('(.*?)' + c), {|s1| s=s1; c + s1});
+        s.len;
+    }
+}
+
+func decode(nums) {
+    var table = ('a'..'z' -> join);
+    nums.map { |n|
+        var s = '';
+        table.sub!(Regex('(.{' + n + '})(.)'), {|s1, s2| s=s2; s2 + s1});
+        s;
+    }.join;
+}
+
+%w(broood bananaaa hiphophiphop).each { |test|
+    var encoded = encode(test);
+    say "#{test}: #{encoded}";
+    var decoded = decode(encoded);
+    print "in" if (decoded != test);
+    say "correctly decoded to #{decoded}";
+}

Task/Move-to-front-algorithm/Sidef/move-to-front-algorithm-2.sidef

@@ -0,0 +1,36 @@
+module MoveToFront {
+
+  define ABC = @("a".."z")
+
+  func m2f(ar,i) {
+    [ar.delete_index(i)] + ar
+  }
+
+  func encode(str) {
+    var ar = ABC+[]
+    gather {
+      str.each_char { |char|
+        take(var i = ar.index(char))
+        ar = m2f(ar, i);
+      }
+    }
+  }
+
+  func decode(indices) {
+    var ar = ABC+[]
+    gather {
+      indices.each { |i|
+        take ar[i];
+        ar = m2f(ar, i)
+      }
+    }.join
+  }
+}
+
+%w(broood bananaaa hiphophiphop).each { |test|
+    var encoded = MoveToFront::encode(test);
+    say "#{test}: #{encoded}";
+    var decoded = MoveToFront::decode(encoded);
+    print "in" if (decoded != test);
+    say "correctly decoded to #{decoded}";
+}