change 1 to 0

src/lib.rs

@@ -75,7 +75,7 @@ pub fn eval_mem(bf_str: &&str, mem: &mut [u8], pointer: &mut usize) -> Result<()
         }
         if char == '<' {
             if *pointer == 0 {
-                return Err(format!("Attempt to reduce pointer to less than 1 ({})", pos));
+                return Err(format!("Attempt to reduce pointer to less than 0 ({})", pos));
             }
             *pointer -= 1;
             continue