diff --git a/common/include/dscreen_util.h b/common/include/dscreen_util.h
index 8b113e5..aea2439 100644
--- a/common/include/dscreen_util.h
+++ b/common/include/dscreen_util.h
@@ -23,6 +23,7 @@ namespace DistributedHardware {
 int32_t GetLocalDeviceNetworkId(std::string &networkId);
 std::string GetRandomID();
 std::string GetAnonyString(const std::string &value);
+std::string GetInterruptString(const std::string &value);
 } // namespace DistributedHardware
 } // namespace OHOS
 #endif
\ No newline at end of file
diff --git a/common/src/dscreen_util.cpp b/common/src/dscreen_util.cpp
index 129902f..bd38019 100644
--- a/common/src/dscreen_util.cpp
+++ b/common/src/dscreen_util.cpp
@@ -98,12 +98,13 @@ std::string GetAnonyString(const std::string &value)
 std::string GetInterruptString(const std::string &value)
 {
     constexpr size_t INT32_MIN_ID_LENGTH = 3;
+    constexpr size_t STRING_HALF_LENGTH = 2;
     std::string res;
     size_t strlen = value.length();
-    if(strlen <= INT32_MIN_ID_LENGTH) {
+    if (strlen <= INT32_MIN_ID_LENGTH) {
         res = value;
     } else  {
-        res = value.substr(0, strlen / 2);
+        res = value.substr(0, strlen / STRING_HALF_LENGTH);
     }
 
     return res;