September Morn Update

Task/Rep-string/Swift/rep-string.swift

@@ -0,0 +1,26 @@
+import Foundation
+
+func repString(_ input: String) -> [String] {
+  return (1..<(1 + input.count / 2)).compactMap({x -> String? in
+    let i = input.index(input.startIndex, offsetBy: x)
+    return input.hasPrefix(input[i...]) ? String(input.prefix(x)) : nil
+  })
+}
+
+let testCases = """
+                1001110011
+                1110111011
+                0010010010
+                1010101010
+                1111111111
+                0100101101
+                0100100
+                101
+                11
+                00
+                1
+                """.components(separatedBy: "\n")
+
+for testCase in testCases {
+  print("\(testCase) has reps: \(repString(testCase))")
+}