Add files via upload - Palindrome Checker in Swift

PalindromeChecker/palindromeChecker.swift

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+import Foundation
+
+// Returns the first character of a string
+func first(_ word: String) -> Character? {
+    return word.first
+}
+
+// Returns the last character of a string
+func last(_ word: String) -> Character? {
+    return word.last
+}
+
+// Returns all but the first and last characters of a string
+func middle(_ word: String) -> String {
+    guard word.count > 2 else {
+        return ""
+    }
+    return String(word.dropFirst().dropLast())
+}
+
+// Prints whether a word is a palindrome or not
+func isPalindrome(_ word: String) {
+    if word.count <= 1 {
+        print("'\(word)' is a palindrome.")
+        return
+    }
+    if first(word) != last(word) {
+        print("'\(word)' is not a palindrome.")
+        return
+    }
+    isPalindrome(middle(word))
+}
+
+// Main function to handle user input
+func main() {
+    print("Enter a word to check if it is a palindrome:")
+    if let word = readLine()?.trimmingCharacters(in: .whitespacesAndNewlines) {
+        isPalindrome(word)
+    } else {
+        print("Invalid input.")
+    }
+}
+
+// Call the main function to start the program
+main()