feat: palindrome

pkg/valid_palindrome/main.go

@@ -0,0 +1,30 @@
+package valid_palindrome
+
+import (
+	"regexp"
+	"strings"
+)
+
+var notAlphanumeric = regexp.MustCompile(`[^a-zA-Z0-9]`)
+
+func KeepAlphanumeric(text string) string {
+	return notAlphanumeric.ReplaceAllString(text, "")
+}
+
+func IsPalindrome(text string) bool {
+	scrubbed := strings.ToLower(KeepAlphanumeric(text))
+
+	start := 0
+	end := len(scrubbed) - 1
+
+	for start < end {
+		if scrubbed[start] != scrubbed[end] {
+			return false
+		}
+
+		start++
+		end--
+	}
+
+	return true
+}