Sử dụng hàm fgets để nhập struct nhưng khi in bị mất phần tử đầu tiên

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct STUDENT {
    char hoten[30];
}Student;

void ReadStudent(Student std[],int n)// nhap ten hoc sinh
{
    for(int i =0; i<n; i++)
    {
        printf("Nhap ten cho hoc sinh thu %d.
", i+1);
        fgets(std[i].hoten, 30,stdin);
    }
}

char tachChuCaiDau(char hoten[]){//tach chu cai dau cua ten
    int i =strlen(hoten)-1;
    
    while(hoten[i] != ' ') i --;
    return hoten[i+1];
}

char *tachTen(char hoten[]){//tach ten
    int i = strlen(hoten)-1;
    
    while(hoten[i]!= ' ') i--;
    return &hoten[i+1];
}

Student *arrangeStudent(Student std[],int n)// sap xep hoc sinh theo abc
{
    Student temp;
    //so sanh vs [i+1]
    //neu ...  thi doi cho
    for(int i =0; i< n-1; i++){
        for(int j = i+1; j< n; j++){
            if((int)tachChuCaiDau(std[i].hoten)>(int)tachChuCaiDau(std[i+1].hoten))
            {
                temp = std[i];
                std[i] = std[j];
                std[j] = temp;
            }
        }
    }

    return std;
}

void printStudent(Student *std,int n)// in hoc sinh theo sap xep
{
    printf("%-50s%-20s
","Number","Name");

    for(int i=0; i<n; i++){
        printf("%-50d%-20s",i+1,(std+i)->hoten);
        printf("

");
    }
}

int main()
{
    int num;
    printf("Input number of student: ");
    scanf("%d",&num);
    Student std[num];

    ReadStudent(std, num);
    arrangeStudent(std, num);
    printStudent(std,num);
    return 0;
}