Linker command failed _main not found - c

Question

I'm a college student beginner in C language. I was trying to run a program in which a matrix initializes with all values = 0, then the user enters values and finally the program searches a user input number inside a matrix, telling the row and column of said value.
But this error:
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
won't stop coming up (I use visual studio code for mac) and I cannot get rid of it.
I've been searching all over internet but I can't find a solution and my teacher said "never heard of this error." I would appreciate your help :)
The function in which I need help is CercadorNumero.
I have two libraries, main library and functions library.
main:
#include <stdio.h>
#include <stdlib.h>
#define FILA 3
#define COLUMNA 3
void printMatriu (int entraMatriu[FILA][COLUMNA]);
int sumaFila (int matriu[][COLUMNA], int numFila);
int CercadorNumero (int buscaMatriu[FILA][COLUMNA], int valor, int *p, int *f); //p i f indicaran les cordenades
int main(int argc, char *argv[])
{
int matriu [FILA][COLUMNA];
for (int i=0; i<FILA; i++){
for (int j=0; j<COLUMNA; j++)
{
matriu[i][j]=0;
}
}
for (int i=0; i<FILA; i++)
{
for (int j=0; j<COLUMNA; j++)
{
do{
printf("Entrant el valor de la columna %d, fila %d: ", i+1, j+1);
scanf("%2d", &matriu[i][j]);
}while(matriu[i][j]<0 || matriu[i][j]>15);
}
printf("\n");
}
printMatriu(matriu);
int suma, numFila;
for(int i = 0; i < FILA; i++)
{
suma = sumaFila(matriu, i);
printf("La suma de la fila %d es: %d\n", i+1, suma);
}
int resultat, numCercar, columnaTrobada, filaTrobada;
do{
printf("Diga'm el numero que vols buscar: \n");
scanf("%d", &numCercar);
resultat = CercadorNumero (matriu, numCercar, &columnaTrobada, &filaTrobada);
if (resultat == 1)
{
printf("%d Trobat a les coordenades: %d %d", numCercar, columnaTrobada, filaTrobada);
} else
{
printf("valor no trobat");
}
} while(numCercar<0 || numCercar>100);
return 0;
}
functions:
#include <stdio.h>
#define FILA 3
#define COLUMNA 3
void printMatriu (int entraMatriu[FILA][COLUMNA]){
for (int i=0; i<FILA; i++){
for (int j=0; j<COLUMNA; j++){
printf("%2d ", entraMatriu[i][j]);
}
printf("\n");
}
}
int sumaFila (int matriu[][COLUMNA], int numFila)
{
int suma=0;
for (int j = 0; j < COLUMNA; j++)
{
suma = suma + matriu[numFila][j];
}
return suma;
}
int CercadorNumero (int buscaMatriu[FILA][COLUMNA], int valor, int *p, int *f)
{
int valorResultat = 0;
*p = 0;
*f = 0;
for (int i = 0; i < FILA; i++)
{
for (int j = 0; j < COLUMNA;)
{
if (buscaMatriu[i][j] == valor)
{
valorResultat = 1;
*p = i; //posició de memoria p guarda el valor de i en el moment que es igual al valor (fila)
*f = j; //posició de memoria f guarda el valor de j en el moment que es igual al valor (columna)
return valorResultat;
} else j++;
}
}
return valorResultat;
}