Add tasks for all the new languages

Task/Arithmetic-Complex/LFE/arithmetic-complex-1.lfe

@@ -0,0 +1,3 @@
+(defrecord complex
+  real
+  img)

Task/Arithmetic-Complex/LFE/arithmetic-complex-2.lfe

@@ -0,0 +1,17 @@
+(defun add
+  (((match-complex real r1 img i1)
+    (match-complex real r2 img i2))
+   (new (+ r1 r2) (+ i1 i2))))
+
+(defun mult
+  (((match-complex real r1 img i1)
+    (match-complex real r2 img i2))
+   (new (- (* r1 r2) (* i1 i2))
+              (+ (* r1 i2) (* r2 i1)))))
+
+(defun neg
+  (((match-complex real r img i))
+   (new (* -1 r) (* -1 i))))
+
+(defun inv (cmplx)
+  (div (conj cmplx) (modulus cmplx)))

Task/Arithmetic-Complex/LFE/arithmetic-complex-3.lfe

@@ -0,0 +1,3 @@
+(defun conj
+  (((match-complex real r img i))
+   (new r (* -1 i))))

Task/Arithmetic-Complex/LFE/arithmetic-complex-4.lfe

@@ -0,0 +1,11 @@
+(defun new (r i)
+  (make-complex real r img i))
+
+(defun modulus (cmplx)
+  (mult cmplx (conj cmplx)))
+
+(defun div (c1 c2)
+   (let* ((denom (complex-real (modulus c2)))
+          (c3 (mult c1 (conj c2))))
+     (new (/ (complex-real c3) denom)
+          (/ (complex-img c3) denom)))))

Task/Arithmetic-Complex/LFE/arithmetic-complex-5.lfe

@@ -0,0 +1,11 @@
+(defun ->str
+  (((match-complex real r img i)) (when (>= i 0))
+   (->str r i "+"))
+  (((match-complex real r img i))
+   (->str r i "")))
+
+(defun ->str (r i pos)
+  (io_lib:format "~p ~s~pi" `(,r ,pos ,i)))
+
+(defun print (cmplx)
+  (io:format (++ (->str cmplx) "~n")))