trim white spaces

src/hakurei.cpp

@@ -3,6 +3,7 @@
 // $  patchelf --set-rpath /usr/local/lib/gcc13 hakurei
 
 
+
 #include <iostream>
 #include <vector>
 #include <algorithm>
@@ -18,6 +19,8 @@
 #include <fstream>
 #include <ctime>
 
+
+
 struct Entry {
   const std::string_view decoded_view;
   const uint64_t id;
@@ -46,6 +49,19 @@ inline std::pair<std::string, std::string> remove_one_utf8_char(const std::strin
   return {"", ""};
 }
 
+
+std::string trim(const std::string& str) {
+    size_t start = str.find_first_not_of(" \t\n\r\f\v");
+    size_t end = str.find_last_not_of(" \t\n\r\f\v");
+    
+    if (start == std::string::npos || end == std::string::npos)
+        return ""; // String contains only whitespace
+
+    return str.substr(start, end - start + 1);
+}
+
+
+
 inline std::string get_input(const int argc, char* const argv[], const bool goldendict_mode) {
   std::string search_string;
   if (!isatty(fileno(stdin))) { 
@@ -79,7 +95,8 @@ inline std::string get_input(const int argc, char* const argv[], const bool gold
     std::cerr << "Search string not provided." << std::endl;
     exit(1);
   }
-  return search_string;
+  
+  return trim(search_string);
 }
 
 inline std::filesystem::path find_dic_file() {