Allocating memory for a struct variable using a function

As part of a larger project, I am trying to write a function that will allocate enough memory for a struct variable and assign values to its member variables after scanning them from the keyboard. In other words, I am trying to create a sort of a constructor function. The reason for this is because I think that's the best way to create a database-like program in c, where all the student_t variables will be stored in a student_t* array called classroom.

#include <stdio.h>
#include <stdlib.h>
#define N 10
#define STRLIM 50

typedef struct student{
char* name;
int age;
}student_t;


student_t* init_student(student_t* s);

int i=0;//its the array counter
student_t* classroom[N];

int main(int argc, char const *argv[]){

while(i<N){
  //  classroom[i]=(student*)malloc(sizeof(student));
    init_student(classroom[i]);
    classroom[i]->age=i;
    printf("The age of student #%d is : %d \n",i,classroom[i]->age);
    printf("the name of student #%d is : %s",i,classroom[i]->name);
    i++;
}

    printf("the size of the classroom is : %ld",sizeof(classroom));
    return 0;
}//end of main()

student_t* init_student(student_t* s){
    s=(student_t*)malloc(sizeof(student_t));
    s->name=(char*)malloc(sizeof(char)*STRLIM);
    fflush(stdin);
    fgets(s->name,STRLIM,stdin);

    return s;
}

Gdb ouput shown in the attached image here.

Please check out my repo. I am guessing something about my build and datatypes is off .Thanks in advance.