question: public String pullRequestUrl ( String account , String collection , String repoId , String pullRequest ) { Objects . requireNonNull ( repoId , "Repository required" ) ; Objects . requireNonNull ( pullRequest , "Pull request required" ) ; return getTeamBaseUrl ( account , collection ) + format ( PULL_REQUEST , repoId , pullRequest ) + getApiVersion ( ) ; }
target:  Returns pull request url.