fix style issues

Change-Id: I4fbac59fdc87c8059cb09838a3604b811e14ff1f
diff --git a/src/name-assignment/assignment-param.cpp b/src/name-assignment/assignment-param.cpp
index b99d685..53022cc 100644
--- a/src/name-assignment/assignment-param.cpp
+++ b/src/name-assignment/assignment-param.cpp
@@ -30,7 +30,7 @@
 {}
 
 std::vector<PartialName>
-AssignmentParam::assignName(const std::multimap<std::string, std::string> &params)
+AssignmentParam::assignName(const std::multimap<std::string, std::string>& params)
 {
   std::vector<PartialName> resultList;
   Name result;