C语言函数问题通用排序函数

```c
#include <stdio.h>
#include <string.h>
int* zee_int (void* a,void* b){
    return *(int *)a - *(int *)b;
}
void print_int (void* data){
    printf("%d,",*(int *)data);
}
void func(void* arr,int len,int size,int (*zee)(void*,void*)){
    int i,k;
    char temp[size];
    for(i=0;i<len;i++){
        for(k=0;k<len;k++){
            if(zee(arr+k*size,arr+(k+1)*size)<0){
                memcpy(temp,arr+(k+1)*size,size);
                memcpy(arr+(k+1)*size,arr+k*size,size);
                memcpy(arr+k*size,temp,size);
            }
        }
    }
}
void print(void* arr,int len,int size,void(*print_arr)(void*)){
    for(int i =0;i<len;i++){
        print_arr(arr+i*size);
    }
}
int main(){
    int a [6] = {1,2,3,4,5};
    func(a,6,4,zee_int);
    print(a,6,4,print_int);
    return 0;
}

有什么问题吗为什么会报错
returning int from a function with return type int * makes pointer from integer without a cast [-Wint-conversion]
passing argument 4 of func from incompatible pointer type [-Wincompatible-pointer-types]

这咋个通用，还不如写个模板函数了，参数用void* 了，里面计算的时候不还是转成int了吗，那干脆就用int做参数就行呗！