Help me with the code!

run();
reverse();
void main()
{
   trisb=0;
   }
   run()
   {
   portb=1;
   delay_ms(100);
   do{
   portb=portb<<1;
   if(portb.f4>=1)
   {
   delay_ms(100);
   reverse();
    }
   }
   while(1);
   }
   reverse()
   {
   portb=0b00010000;
   delay_ms(100);
   do{
   portb=portb>>1;
   if(portb.f0<=1)
   {
   delay_ms(100);
   main();
   }
   }
   while(1);
    }

void run();
void reverse();

void main(){
     trisb=0;
   while(1){
     run();
     reverse();
     }
}
   
void run(){
   portb=1;
   while(!portb == 0x10){
     portb=portb<<1;
     delay_ms(100);
   }
}

void reverse(){
   portb=0b00010000;
   while(!portb == 0x1){
     portb=portb>>1;
     delay_ms(100);
   }
  }