diff --git a/src/cppcommon/str_functs.cpp b/src/cppcommon/str_functs.cpp
index 8d41ce9..a0075ad 100644
--- a/src/cppcommon/str_functs.cpp
+++ b/src/cppcommon/str_functs.cpp
@@ -228,11 +228,6 @@ namespace CPPCOMMON
 		return res;
 	}
 
-	bool strStartsWith(const string& str, const string& prefix)
-	{
-		return str.substr(0, prefix.size()) == prefix;
-	}
-
 }
 
 #ifdef TEST_STR_FUNCTS
@@ -302,15 +297,17 @@ int main()
 	//	s = utf8ToGbk(s);
 	//	cout<<s<<endl;
 	//}
-	//cout<<strStartsWith("--help","--")<<endl;
-	//cout<<strStartsWith("--help","-")<<endl;
-	//cout<<strStartsWith("--help","he")<<endl;
-	//cout<<strStartsWith("help","help")<<endl;
-	//cout<<strStartsWith("","help")<<endl;
-	//cout<<strStartsWith("hel","")<<endl;
-	string s("  helloword heh\t");
-	string b;
-	cout<<trim(b)<<"11"<<endl;
+	cout<<strStartsWith("--help","--")<<endl;
+	cout<<strStartsWith("--help","-")<<endl;
+	cout<<strStartsWith("--help","he")<<endl;
+	cout<<strStartsWith("help","help")<<endl;
+	cout<<strStartsWith("","help")<<endl;
+	cout<<strStartsWith("hel","")<<endl;
+	cout<<strEndsWith("hel","")<<endl;
+	cout<<strEndsWith("hel","el")<<endl;
+	//string s("  helloword heh\t");
+	//string b;
+	//cout<<trim(b)<<"11"<<endl;
 	return 0;
 }
 #endif
diff --git a/src/cppcommon/str_functs.h b/src/cppcommon/str_functs.h
index d362229..6fd8e01 100644
--- a/src/cppcommon/str_functs.h
+++ b/src/cppcommon/str_functs.h
@@ -63,7 +63,24 @@ namespace CPPCOMMON
 		cout<<uniVecToStr(unicode)<<endl;
 	}
 
-	bool strStartsWith(const string& str, const string& prefix);
+	inline bool strStartsWith(const string& str, const string& prefix)
+	{
+		//return str.substr(0, prefix.size()) == prefix;
+		if(prefix.length() > str.length())
+		{
+			return false;
+		}
+		return 0 == str.compare(0, prefix.length(), prefix);
+	}
+
+	inline bool strEndsWith(const string& str, const string& suffix)
+	{
+		if(suffix.length() > str.length())
+		{
+			return false;
+		}
+		return 0 == str.compare(str.length() -  suffix.length(), suffix.length(), suffix);
+	}
 	
 }
 #endif