Printing 1 file to another file with double print of character

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 #include<stdio.h>


int main(){

    FILE *ptr1;

    FILE *ptr2; 

    ptr1 = fopen("a.txt", "r");

    ptr2 = fopen("b.txt", "w");


    char c = fgetc(ptr1);

    while(c!=EOF){

        fputc(c, ptr2);

        fputc(c, ptr2);

        c = fgetc(ptr1);

    }

    fclose(ptr1); 

    fclose(ptr2); 

    return 0;

}

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