foo.cc: In function 'int toInt(char)':
foo.cc:56:14: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
   56 | for(i=strlen(str)-1;i>=0;i--){
      |              ^~~
      |              |
      |              char
In file included from foo.cc:2:
/nix/store/iczlqwdj10xiz3mmms6adnra0mn3ljk1-glibc-2.35-224-dev/include/string.h:407:35: note:   initializing argument 1 of 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
foo.cc:57:14: error: invalid types 'char[int]' for array subscript
   57 | ans+=base(str[i]-'0');
      |              ^
foo.cc:57:21: error: 'base' cannot be used as a function
   57 | ans+=base(str[i]-'0');
      |                     ^

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