# 15 input files, 1 thread, clang++ -std=c++20
strtok_r  9.655 seconds
strchr    8.713 seconds

##</code><code>##

while ( ::fgets(line, MAX_LINE_LEN_L, fh) != NULL ) {
   found = ::strchr(line, '\t');
   count = ::atoll( &line[found - line + 1] );
   line[found - line] = '\0';  // word
   ...
}

##</code><code>##

::memcpy( fixword.data(), line, found - line );