Changed express apps for routers

Changing apps to follow suggested practices from documentation
and centralizing prefix /api/v1 in the app module.

src/libs/app.js

@@ -29,7 +29,7 @@ app.use(cors());
 app.use(methodOverride());
 app.use(cache('1 day'));
 app.use(compression(9));
-app.use(api);
+app.use('/api/v1', api);
 
 // catch 404 and forward to error handler
 app.use((req, res, next) => {

src/libs/routes/api.js

@@ -17,10 +17,10 @@ api.get('/api/v1', (req, res) => {
 });
 
 // mount API routes
-api.use('/api/v1/enrollment', enrollment);
-api.use('/api/v1/state', state);
-api.use('/api/v1/region', region);
-api.use('/api/v1/city', city);
-api.use('/api/v1/school', school);
+api.use('/enrollment', enrollment);
+api.use('/state', state);
+api.use('/region', region);
+api.use('/city', city);
+api.use('/school', school);
 
 module.exports = api;

src/libs/routes/city.js

 const express = require('express');
 
-const cityApp = express();
+const cityApp = express.Router();
 
 const libs = `${process.cwd()}/libs`;
 

src/libs/routes/enrollment.js

 const express = require('express');
 
-const enrollmentApp = express();
+const enrollmentApp = express.Router();
 
 const libs = `${process.cwd()}/libs`;
 

src/libs/routes/region.js

 const express = require('express');
 
-const regionApp = express();
+const regionApp = express.Router();
 
 const libs = `${process.cwd()}/libs`;
 

src/libs/routes/school.js

 const express = require('express');
 
-const schoolApp = express();
+const schoolApp = express.Router();
 
 const libs = `${process.cwd()}/libs`;
 

src/libs/routes/state.js

 const express = require('express');
 
-const stateApp = express();
+const stateApp = express.Router();
 
 const libs = `${process.cwd()}/libs`;