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1#include <stdlib.h>2#include <string.h>34/* Reverse a string in-place. Returns s. */5char *strrev(char *s) {6    if (!s) return NULL;7    size_t len = strlen(s);8    for (size_t i = 0, j = len - 1; i < j; i++, j--) {9        char tmp = s[i];10        s[i]     = s[j];11        s[j]     = tmp;12    }13    return s;14}1516/* Split str by delim into a NULL-terminated array. Caller frees. */17char **split(const char *str, char delim, size_t *count) {18    size_t n = 1;19    for (const char *p = str; *p; p++) n += (*p == delim);20    char **parts = malloc((n + 1) * sizeof *parts);21    /* ... */22    return parts;23}