rem: char *get_pay_type(enum ExpensePayment type)
add: get_pay_type(enum ExpensePayment type)
context: char *get_pay_type(enum ExpensePayment type){   switch (type) {    case epAmEx:      return "AmEx";    case epCash:      return "Cash";    case epCheck:      return "Check";    case epCreditCard:      return "CreditCard";    case epMasterCard:      return "MasterCard";    case epPrepaid:      return "Prepaid";    case epVISA:      return "VISA";    case epUnfiled:      return "Unfiled";    default:      return NULL;   }}