c generic swap

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

void swap(void *a, void *b, size_t width)
{
    void *temp = malloc(width);
    memcpy(temp, b, width);
    memcpy(b, a, width);
    memcpy(a, temp, width);
    free(temp);
}

int main() {
    char a = 'a', b = 'b';
    swap(&a, &b, sizeof(a));
    printf("%c %c\n", a, b);
    return 0;
}