feat: reto mouredev#24 - go >> [E]

Retos/Reto #24 - CIFRADO CÉSAR [Fácil]/go/qwik-zgheib.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Cipher interface {
+	Encrypt(text string, shift int) string
+	Decrypt(text string, shift int) string
+}
+
+type CaesarCipher struct{}
+
+func NewCaesarCipher() *CaesarCipher {
+	return &CaesarCipher{}
+}
+
+func (cc *CaesarCipher) Encrypt(text string, shift int) string {
+	return caesar(text, shift)
+}
+
+func (cc *CaesarCipher) Decrypt(text string, shift int) string {
+	return caesar(text, -shift)
+}
+
+func caesar(text string, shift int) string {
+	var result strings.Builder
+	for _, char := range text {
+		if char >= 'a' && char <= 'z' {
+			result.WriteRune('a' + (char-'a'+rune(shift)+26)%26)
+		} else if char >= 'A' && char <= 'Z' {
+			result.WriteRune('A' + (char-'A'+rune(shift)+26)%26)
+		} else {
+			result.WriteRune(char)
+		}
+	}
+	return result.String()
+}
+
+func main() {
+	cipher := NewCaesarCipher()
+
+	originalText := "Hello, World!"
+	shift := 3
+
+	encryptedText := cipher.Encrypt(originalText, shift)
+	fmt.Printf("Original: %s\nEncrypted: %s\n", originalText, encryptedText)
+
+	decryptedText := cipher.Decrypt(encryptedText, shift)
+	fmt.Printf("Encrypted: %s\nDecrypted: %s\n", encryptedText, decryptedText)
+}