I have a struct in the following format

typedef struct small {
    int a;
} small;

typedef struct large {
    small s;
    int b;
} large;

I would like to write a function which will modify the variable a. However in the function declaration/signature I would like to have small along the lines of

void modifyA(small* s, int newVal){
  s->a = newVal;
}

I would like to keep the modifyA function common to be supplied with both large and small. Is there a way to achieve this for large as input to modifyA function?