fix(memory): Safety check

src/modules/memory.cpp

@@ -47,8 +47,10 @@ namespace modules {
 
       while (std::getline(in, str) && i++ < 3) {
         size_t off = str.find_first_of("1234567890", str.find(':'));
+        if (off != string::npos && str.size() > off) {
           buffer << std::strtol(&str[off], nullptr, 10) << std::endl;
         }
+      }
 
       buffer >> rdbuf;
       kb_total = std::atol(rdbuf.c_str());