set the last byte in allocated char array to zero.

Author: oleksandr-pavlyk

dpctl-capi/helper/include/dpctl_string_utils.hpp

@@ -50,6 +50,7 @@ cstring_from_string(const std::string &str)
 #else
         std::strncpy(cstr, str.c_str(), cstr_len);
 #endif
+        cstr[cstr_len - 1] = '\0';
     } catch (std::bad_alloc const &ba) {
         // \todo log error
         std::cerr << ba.what() << '\n';