In Molecular Genetics, there is a notion of an Open Reading Frame $($ORF$).$ An ORF is a portion of DNA that is used as the blueprint for a protein. All ORFs start with a particular sequence, and end with a particular sequence. In this task, we wish to find all sections of a genome which start with a given sequence of characters, and end with a $($possibly$)$ different given sequence of characters. To solve this problem, you will need to create a class OrfFinder. The constructor for this class takes a string genome as a parameter. Additionally, this class will need a method find$($start$,$ end$).$