- Takes &Vec and counts the quantity of each word. Returns Hashmap<String,u32>, with String being the word and u32 the quantity 
- Get maximum index and garantee that index does not exeed total length of Vec 
- Get mininum index and guarantee that index is alway >=0 
- save file to path. Return result. 
- Sort words in HashMap<Word, Frequency> according to frequency into Vec<String, u32>. 
- Splits String into single words as Vector.
Splits String at whitespaces and removes chars like , or ?. Change the relevant line to remove or add chars from provided String.