remove duplication from users.js

[championswimmer]

check https://codebeat.co/projects/github-com-coding-blocks-leads-tracker-backend-master/report_classes/javascript-src%2Frouters%2Fapi%2Fusers-js

[apoorvaagupta]

@championswimmer the errors are coming for the catch part of functions as most of the code there is same. so how can we remove that duplication as we need the catch function in every router!