C programme to check if a linked list is circular

// c program to check if a linked list is circular

struct Node {
    int data ;
    struct Node* next ;

};

typedef Node* Node ;

int isCircularLinkedList(Node head)
{
     Node slowPtr = fastPtr = head ;
    
     while (slowPtr && fastPtr )
     {
        slowPtr = slowPtr->next ;
        fastPtr = fastPtr -> next;
       
        if( ! fastPtr )
        {
            return 0 ;
        }
        else {
            fastPtr = fastPtr - > next ;
        }
       
        if( slowPtr = fastPtr )
            return 1 ;
       
     }
    
     return 0 ;
}