View Compilation Error

0_0_39512661_25951.cpp: In function 'std::string multiplySingleDigit(const std::string&, int)':
0_0_39512661_25951.cpp:19:5: error: 'reverse' was not declared in this scope
   19 |     reverse(result.begin(), result.end());
      |     ^~~~~~~
0_0_39512661_25951.cpp: In function 'std::string addStrings(const std::string&, const std::string&)':
0_0_39512661_25951.cpp:39:5: error: 'reverse' was not declared in this scope
   39 |     reverse(result.begin(), result.end());
      |     ^~~~~~~