Visual Studio Code – Problem with C header file: Undefined Reference Error

I am currently working on a C programming project and have encountered an issue that I’m struggling to resolve.

The problem:

I am using Visual Studio Code (VS Code) as my code editor. The project consists of the following files:

main.c:

#include "list.h"
#include <stdio.h>

int main()
{
    List* l = lst_create();
    l = lst_inset(l,10);
    l = lst_inset(l,20);
    l = lst_inset(l,25);
    l = lst_inset(l,30);
    //l = lst_rem(l,10); 
    lst_print(l);

    return 0;
}

List.c:

#include <stdio.h>
#include <stdlib.h>
#include "list.h"

struct list
{
    int info;
    List *next;
};

List* lst_create()
{
    return NULL;
}

int lst_empty(List *l)
{
    return (l == NULL);
}

List* lst_inset(List *l, int info)
{
    List* lAux = (List*) malloc(sizeof(List));

    lAux -> info = info;
    lAux -> next = l;

    return lAux;
}

List* lst_search(List *l, int info)
{
    List* lAux = l;

    while (lAux != NULL)
    {
        if (lAux -> info == info)
        {
            return lAux;
        }

        lAux = lAux -> next;
    }

    return NULL;
}

void lst_print(List *l)
{
    List* lAux = l;

    while (lAux != NULL)
    {
        printf("Info = %dn", lAux -> info);
        lAux = lAux -> next;
    }
}

list.h:

#ifndef LIST_H
#define LIST_H

typedef struct list List;

List* lst_create();

int lst_empty(List *l);

List* lst_inset(List *l, int info);

//List* lst_remove(List *l, int info);

//void lst_free(List *l);

void lst_print(List *l);

List* lst_search(List *l, int info);

#endif

I have included "list.h" in "main.c" to use the functions defined in list.c. However, when I attempt to compile the project, I encounter the following linker error:

/usr/bin/ld: /tmp/ccCzNKTb.o: in function 'main':
/home/user/Codes/C/TestProject/src/main.c:7: undefined reference to 'lst_create'
/home/user/Codes/C/TestProject/src/main.c:8: undefined reference to 'lst_insert'
/home/user/Codes/C/TestProject/src/main.c:9: undefined reference to 'lst_insert'
/home/user/Codes/C/TestProject/src/main.c:10: undefined reference to 'lst_insert'
/home/user/Codes/C/TestProject/src/main.c:11: undefined reference to 'lst_insert'
/home/user/Codes/C/TestProject/src/main.c:13: undefined reference to 'lst_print'
collect2: error: ld returned 1 exit status

I have ensured that both main.c and list.c are present in the specified directory. The functions lst_create, lst_insert, and lst_print are declared in list.h and defined in list.c. I have also tested the code in two different C IDEs, but encountered the same "undefined reference" error.I have validated my code by referring to instructional YouTube videos and cross-referenced it with example code. Despite my best efforts, I have not been able to resolve this issue. I even consulted my programming professor, who was unable to identify the problem.