diff --git a/src/TCPUtils.cpp b/src/TCPUtils.cpp
new file mode 100644
index 0000000..c5b4585
--- /dev/null
+++ b/src/TCPUtils.cpp
@@ -0,0 +1,35 @@
+#include "TCPSocket/TCPUtils.hpp"
+
+inline bool startWith(const std::string& str, const std::string& start)
+{
+    return str.rfind(start, 0) == 0;
+}
+
+inline bool endsWith(const std::string& str, const std::string& end)
+{
+    if (str.length() >= end.length())
+    {
+        return (0 == str.compare(str.length() - end.length(), end.length(), end));
+    }
+    return false;
+}
+
+inline bool contains(const std::string& str, const std::string& sub)
+{
+    return str.find(sub) != std::string::npos;
+}
+
+inline std::vector<std::string> split(const std::string& str, const std::string& delimiter)
+{
+    std::vector<std::string> tokens;
+    size_t prev = 0, pos = 0;
+    do
+    {
+        pos = str.find(delimiter, prev);
+        if (pos == std::string::npos) pos = str.length();
+        std::string token = str.substr(prev, pos - prev);
+        if (!token.empty()) tokens.push_back(token);
+        prev = pos + delimiter.length();
+    } while (pos < str.length() && prev < str.length());
+    return tokens;
+}
\ No newline at end of file