Add tasks for all the new languages

Task/IBAN/Sidef/iban.sidef

@@ -0,0 +1,31 @@
+func valid_iban(iban) {
+  static len = Hash.new(
+    AD=>24, AE=>23, AL=>28, AO=>25, AT=>20, AZ=>28, BA=>20, BE=>16, BF=>27,
+    BG=>22, BH=>22, BI=>16, BJ=>28, BR=>29, CG=>27, CH=>21, CI=>28, CM=>27,
+    CR=>21, CV=>25, CY=>28, CZ=>24, DE=>22, DK=>18, DO=>28, DZ=>24, EE=>20,
+    EG=>27, ES=>24, FI=>18, FO=>18, FR=>27, GA=>27, GB=>22, GE=>22, GI=>23,
+    GL=>18, GR=>27, GT=>28, HR=>21, HU=>28, IE=>22, IL=>23, IR=>26, IS=>26,
+    IT=>27, JO=>30, KW=>30, KZ=>20, LB=>28, LI=>21, LT=>20, LU=>20, LV=>21,
+    MC=>27, MD=>24, ME=>22, MG=>27, MK=>19, ML=>28, MR=>27, MT=>31, MU=>30,
+    MZ=>25, NL=>18, NO=>15, PK=>24, PL=>28, PS=>29, PT=>25, QA=>29, RO=>24,
+    RS=>22, SA=>24, SE=>24, SI=>19, SK=>24, SM=>27, SN=>28, TN=>24, TR=>26,
+    UA=>29, VG=>24,
+  );
+
+  # Ensure upper alphanumeric input.
+  iban -= /\s+/g;
+  iban.uc! ~~ /^[0-9A-Z]+\z/ || return false;
+
+  # Validate country code against expected length.
+  var cc = iban.substr(0, 2);
+  iban.len == len{cc} || return false;
+
+  # Shift and convert.
+  iban.sub!(/(.{4})(.+)/, {|a,b| b+a});
+  iban.gsub!(/([A-Z])/,   {|a| a.ord - 55});
+
+  iban.to_i % 97 == 1;
+}
+
+say valid_iban("GB82 WEST 1234 5698 7654 32"); #=> true
+say valid_iban("GB82 TEST 1234 5698 7654 32"); #=> false