defining char array on stack in c code example

Example 1: length of a char array in c

char chararray[10];
size_t len = strlen(chararray);

Example 2: return char array in c

char * createStr() {

    char char1= 'm';
    char char2= 'y';

    char *str = malloc(3);
    str[0] = char1;
    str[1] = char2;
    str[2] = '\0';

    return str;

}