View Compilation Error

0_0_39819797_23844.cpp: In function 'int main()':
0_0_39819797_23844.cpp:13:19: error: 'strlen' was not declared in this scope
   13 |         int len = strlen(str);
      |                   ^~~~~~
0_0_39819797_23844.cpp:4:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include <ctype.h>
  +++ |+#include <cstring>
    4 |