fix: print integers without denominator

src/lib.rs

@@ -1,4 +1,7 @@
-use std::{fmt, ops};
+use std::{
+    fmt::{self, write},
+    ops,
+};
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy, PartialOrd, Ord)]
 pub struct Fraction {
@@ -158,7 +161,11 @@ impl ops::Neg for Fraction {
 
 impl fmt::Display for Fraction {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{0}/{1}", self.num, self.den)
+        if self.num > 1 {
+            return write!(f, "{0}/{1}", self.num, self.den);
+        } else {
+            return write!(f, "{0}", self.num);
+        }
     }
 }