how to return a char array from a function in c

1char * createStr() {
2
3    char char1= 'm';
4    char char2= 'y';
5
6    char *str = malloc(3);
7    str[0] = char1;
8    str[1] = char2;
9    str[2] = '\0';
10
11    return str;
12
13}
14

1#include <stdio.h>
2#include <string.h>
3    char* createStr(){
4    static char str[20] = "my";
5    return str;
6}
7int main(){
8    char a[20];
9    strcpy(a,createStr()); //this will copy the returned value of createStr() into a[]
10    printf("%s",a);
11    return 0;
12}
13