void* splice(int typesize,void* arr,
    int size,int start, int length,
        void* stuff,int size2){
    int gap = length-size2;
    void* ptr = malloc(typesize*(size-gap));//--------(1)--------
    if(ptr==NULL){
        puts("error");
        return NULL;
    }
    memmove(ptr,arr,typesize*size);
    memmove(ptr+typesize*start,stuff,typesize*size2);
    memmove(ptr+typesize*(start+size2),arr+typesize*(start+length),
            typesize*(size-start-length));
    return ptr;
}

int main(){
    setbuf(stdout,NULL);
    int start = 1;
    int delete = 6;
    long long* oldArray= malloc(sizeof(long long)*7);
    long long* stuff = malloc(sizeof(long long)*3);
    oldArray[0]=7LL;
    oldArray[1]=8LL;
    oldArray[2]=4LL;
    oldArray[3]=1LL;
    oldArray[4]=55LL;
    oldArray[5]=67LL;
    oldArray[6]=71LL;
    stuff[0]=111LL;
    stuff[1]=233LL;
    stuff[2]=377LL;
    int newsize = 7-(delete-3);
    void* newArray = splice(sizeof(long long),oldArray,7,start,delete,stuff,3);
    if(newArray){

        //------------crash happens here-----------
        //free(oldArray);
        //-------------

        oldArray =  newArray;
        int i=0;
        for(;i<newsize;i++){
            printf("%I64dn",oldArray[i]);
        }
    }
    return 0;
}