changeRole method
Implementation
void changeRole(String newRole) {
if (newRole == "HOLDER" || newRole == "VERIFIER") {
role = newRole;
} else {
throw Exception("Role must be HOLDER or VERIFIER");
}
}
void changeRole(String newRole) {
if (newRole == "HOLDER" || newRole == "VERIFIER") {
role = newRole;
} else {
throw Exception("Role must be HOLDER or VERIFIER");
}
}