Demo of strrchr C function

basename.c

// https://en.cppreference.com/w/c/string/byte/strrchr

#include <stdio.h>
#include <string.h>

int main(int argc, char* argv[])
{
    if(argc < 2)
        return -1;

    const char pathsep = '/';
    const char* path = argv[1];

    const char* slash = strrchr(path, pathsep);
    const char* basename = slash ? (slash + 1) : path;
    puts(basename);
    return 0;
}