Add tasks for all the new languages

Task/Parsing-RPN-to-infix-conversion/Sidef/parsing-rpn-to-infix-conversion.sidef

@@ -0,0 +1,32 @@
+func p(pair, prec) {
+    pair[0] < prec ? "( #{pair[1]} )" : pair[1];
+}
+
+func rpm_to_infix(string) {
+    say "#{'='*17}\n#{string}";
+    var stack = [];
+    string.each_word { |w|
+        if (w ~~ /\d/) {
+            stack << [9, w.to_f];
+        }
+        else {
+            var y = stack.pop;
+            var x = stack.pop;
+            given(w) {
+              when ('^')   { stack << [4, [p(x,5), w, p(y,4)].join(' ')] }
+              when (<* />) { stack << [3, [p(x,3), w, p(y,3)].join(' ')] }
+              when (<+ ->) { stack << [2, [p(x,2), w, p(y,2)].join(' ')] }
+            }
+            say stack;
+        }
+    };
+    '-'*17 -> say;
+    stack.map{_[1]};
+}
+
+var tests = [
+    '3 4 2 * 1 5 - 2 3 ^ ^ / +',
+    '1 2 + 3 4 + ^ 5 6 + ^',
+];
+
+tests.each { say rpm_to_infix(_).join(' ') }