vetor cadeia caracter

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

int main (void)

{
int i,n, m;
char **alunos;

printf ("Digite numero de alunos\n");
scanf("%d", &n);

printf ("Digite número de caracteres\n");
scanf ("%d", &m);

printf ("Alocacao de memoria\n");

alunos = (char **) malloc (n*sizeof (char));

for (i=0; i<n; i++)
{
alunos[i] = (char *) malloc(n * sizeof(char));

}
printf ("Leitura nomes\n");

for (i=0; i<n; i++)
{
scanf (" %120[^\n]", alunos[i]);

}
printf ("impressao nomes\n");

for (i=0; i<n; i++)
{
printf ("%s\n", alunos[i]);
}
system ("pause");

return 0;

}