Refactors Citizen into component

Refactor CitizenVoter
Split citizens routes

src/main/kotlin/component/citizen/routes/GetOneCitizen.kt

@@ -0,0 +1,23 @@
+package fr.dcproject.component.citizen.routes
+
+import fr.dcproject.citizenOrNull
+import fr.dcproject.component.citizen.Citizen
+import fr.dcproject.component.citizen.CitizenVoter
+import fr.dcproject.voter.assert
+import io.ktor.application.*
+import io.ktor.locations.*
+import io.ktor.response.*
+import io.ktor.routing.*
+
+@KtorExperimentalLocationsAPI
+@Location("/citizens/{citizen}")
+class CitizenRequest(val citizen: Citizen)
+
+@KtorExperimentalLocationsAPI
+fun Route.getOneCitizen(voter: CitizenVoter) {
+    get<CitizenRequest> {
+        voter.assert { canView(it.citizen, citizenOrNull) }
+
+        call.respond(it.citizen)
+    }
+}