fix: bot suggestions

internal/utils/utils.go

@@ -328,5 +328,19 @@ func CheckWhitelist(whitelist string, str string) bool {
 
 // Capitalize just the first letter of a string
 func Capitalize(str string) string {
+	if len(str) == 0 {
+		return ""
+	}
 	return strings.ToUpper(string([]rune(str)[0])) + string([]rune(str)[1:])
 }
+
+// Sanitize header removes all control characters from a string
+func SanitizeHeader(header string) string {
+	return strings.Map(func(r rune) rune {
+		// Allow only printable ASCII characters (32-126) and safe whitespace (space, tab)
+		if r == ' ' || r == '\t' || (r >= 32 && r <= 126) {
+			return r
+		}
+		return -1
+	}, header)
+}