Initial data commit

Task/Longest-common-substring/Sidef/longest-common-substring.sidef

@@ -0,0 +1,13 @@
+func createSubstrings(String word) -> Array {
+  gather {
+    combinations(word.len+1, 2, {|i,j|
+        take(word.substr(i, j-i))
+    })
+  }
+}
+
+func findLongestCommon(String first, String second) -> String {
+    createSubstrings(first) & createSubstrings(second) -> max_by { .len }
+}
+
+say findLongestCommon("thisisatest", "testing123testing")