Example for freeing buffer cells of a pointer to a pointer

free_buffer_cells.c

// Online C compiler to run C program online
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static inline void freeBufferCells(void** buffer, int count) {
    for (int i = 0; i < count; i++) {
        free(buffer[i]);
        buffer[i] = NULL;
    }
}

int main() {
    void** ptr = (void**) calloc(1, sizeof(void**));
    
    char* str0 = (char*) calloc(22, sizeof(char));
    char* str1 = (char*) calloc(22, sizeof(char));
    char* str2 = (char*) calloc(22, sizeof(char));
    
    ptr[0] = str0;
    ptr[1] = str1;
    ptr[2] = str2;
    // Write C code here
    strcat(ptr[0], "hello");
    strcat(ptr[1], "world");
    strcat(ptr[2], "bye");
    
    printf("%s\n", ptr[0]);
    printf("%s\n", ptr[1]);
    printf("%s\n", ptr[2]);
    
    freeBufferCells(ptr, 3);
    
    printf("%s\n", str0);
    printf("%s\n", str1);
    printf("%s\n", str2);

    return 0;
}

Output:

hello
world
bye

�b��
�b��