Minishell problems with cd (C) - c

Question

I made a simple minishell in C and it works, except for the cd command. When I try to run it nothing happens except it creates a child process that never actually ends. For example, after running cd in my minishell I need to type exit twice to exit the minishell, not the standard once.
Code:
int debug=0;
void safeQuit(){
if (debug==1)
printf("INFO: Parent process, pid=%d exiting.\n", getpid());
exit(0);
}
int main(int argc,char** argv)
{
int pid, stat;
char * Array_arg[50];
char command_line[200];//user input
if (argc>1)
if (strcmp(argv[1],"-debug")==0)
debug=1;
while (1){
printf("[minishell]> "+debug);
gets(command_line);
if (strcmp(command_line,"exit")==0)
safeQuit();
char * subcommand=strtok(command_line," "); //divides the string according to the spaces
int i=0;
while (subcommand!= NULL)//insert to array
{
Array_arg[i]=subcommand;
subcommand=strtok(NULL," ");
i++;
}
Array_arg[i]='\0';
if (fork()==0){
if (debug==1)
printf("INFO: child process, pid = %d, executing command %s\n", getpid(), command_line);
execvp(Array_arg[0],Array_arg); //execution of cmd
}
else{
pid=wait(&stat);
}
}
}

Answer 1

cd is necessarily a shell built-in, not an external utility. You want to change the current working directory of the current process (the shell itself), not of a child process. Call chdir instead of forking a child process.
Separately, check execvp for errors and defensively terminate the child after a failed exec. You'd have seen an informative error if you had done so:
... (child) ...
execvp(Array_arg[0], Array_arg);
perror("Error - exec failed"); // If we are here, we did *not* replace the process image
exit(0);