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

int main() {
    char *nev;
    nev = (char*) malloc(10* sizeof(char));
    strcpy(nev, "Lajos");
    printf("%s\n", nev);

    nev = (char*) realloc(nev, 30 * sizeof(char));
    strcpy(nev, "Ferdinándházi Lajos");
    printf("%s\n", nev);

    free(nev);
}