Fixed vaidation errors for createupdate application API.

src/main/java/net/gepafin/tendermanagement/util/Utils.java

@@ -407,6 +407,29 @@ public class Utils {
 		return input.toString();
 	}
 
+	public static String convertToStringForFormFieldValue(Object input) {
+		if (input == null) {
+			return null; // Return string "null" for null input
+		}
+
+		if (input instanceof String) {
+			return (String) input; // Return the string directly if input is a string
+		}
+
+		if (input instanceof Collection<?>) {
+			// Handle collections (List, Set, etc.)
+			return convertCollectionToString((Collection<?>) input);
+		}
+
+		if (input instanceof Map<?, ?>) {
+			// Handle maps
+			return convertMapToString((Map<?, ?>) input);
+		}
+
+		// For other types (like Integer, Boolean, etc.), use toString()
+		return input.toString();
+	}
+
 	private static String convertCollectionToString(Collection<?> collection) {
 		try {
 			return mapper.writeValueAsString(collection); // Convert the collection to a JSON string