ExtractBearerToken extracts token from the 'Authorization: Bearer <token>' header.

FilterEmail value.

FilterStrings returns string slice with only non-empty values.

GenerateRandomString generates random string.

GenerateUUID creates new id string.

JSONConvert converts anything to anything through JSON marshalling.

NormalizePhone removes all characters from the phone except plus and numbers.

ValidateEmail validates email value.

ValidatePhone validates phone number.

ValidateURL checks if string is a valid URL value.

ValidateUUID validates id.