Renamed models to singular for consistency. E.g Rust itself also calls a vector of strings Vec<String>, not Vec<Strings>. The same should be true for a single Transaction or Vec<Transaction>, even if we usually have many.
There already was an inconsistency: not all declarations of Transaction did have the name field, so I had to modify two of the tests
Should resolve #2; Test are passing
Vec<String>, notVec<Strings>. The same should be true for a singleTransactionorVec<Transaction>, even if we usually have many.Transactiondid have thenamefield, so I had to modify two of the tests