C语言问题 uint32_t提取浮点数

请问这个要怎么解决？在//REPLACE ME WITH YOUR CODE那写内容，在float_exp.c上写内容，按照要求来写，要写main函数，就像最下面的图片的例子那样。在可以用下面的例子来测试是否正确。原题为英文，有机翻。da佬编写1下，蟹蟹大lao。题目如下

float_exp.c内容
#include "float_exp.h"

// given the 32 bits of a float return the exponent
uint32_t float_exp(uint32_t f) {
    return 42; // REPLACE ME WITH YOUR CODE
}

float_exp.h内容
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#ifndef FLOAT_EXP_H
#define FLOAT_EXP_H

#include <assert.h>

/// We use `union overlay' to obtain the raw bits of a `float'-type
/// value, by storing the `float' in the `f' field and then using the
/// `u' field to obtain the bits.
union overlay {
    float f;
    uint32_t u;
};

uint32_t float_exp(uint32_t f);

#endif

#include <stdio.h>
#include <stdint.h>
uint32_t float_exp(uint32_t  f)
{
    f = f<<1;
    f = f>>24;
    return f;
}
 
union overlay {
    float f;
    uint32_t u;
};

int main()
{
    overlay lay;
    lay.f = -42;
    printf("0x%x\n",float_exp(lay.u));
    lay.f = 3.14159012;
    printf("0x%x\n",float_exp(lay.u));
    return 0;
}