im very new to programming, trying to learn C and cant figure out how to create/use a simple function.

Im trying to create a function called stringtest and then call it into the main and simply make the string strA print ABC. 

```
void stringtest(char strA[20])
{
    strA = "ABC";
}

int main()
{
    char strA;
    stringtest(strA[20]);
    printf("This is strA", strA);

  return 0;
}

```