The scanf function uses '%c' to accept input, but can perform string input

How to understand the running process of the following code.

void scan(void){
    char item;
    scanf("%c",&item);
    if(item == '#'){
        printf("\n");
        return;
    }
    printf("%c",item);
    scan();
}

Why can I input strings into the console, and scanf will not be executed again in the recursion, but each character will be read automatically instead?

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