Contar elementos/items em um array de ponteiros do tipo char.

count_elements.c

#include <stdio.h>
#include <stdlib.h>

int my_strlen(const char *str);

int main(int argc, char* argv[])
{

    char *teste[10][10] = {
        {"teste"},
        {"b"},
        {"c"},
    };

    char *teste_a[] = {"a", "b", "c", "def"};

    printf("Total of elements: %d\n", my_strlen(teste[0][0]));
    printf("Total of teste_a: %ld\n", sizeof(teste_a) / sizeof(teste_a[0]));
    return 1;
}


int my_strlen (const char *str) {
    int iter = 0;
    const char *p = str;
    while(*p) {
        printf("char: %c\n", *p);
        iter++;
        p++;
    }
    return iter;
}