Formatted iterators

src/utils/iterators/bits.rs

@@ -3,11 +3,13 @@
 pub struct Bits {
     num: i64,
 }
+
 impl Bits {
     pub fn new(num: i64) -> Bits {
         Bits { num }
     }
 }
+
 impl Iterator for Bits {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/collatz.rs

@@ -3,11 +3,13 @@ pub struct Collatz {
     num: i64,
     done: bool,
 }
+
 impl Collatz {
     pub fn new(num: i64) -> Collatz {
         Collatz { num, done: false }
     }
 }
+
 impl Iterator for Collatz {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/continued_fraction.rs

@@ -9,6 +9,7 @@ pub struct ContinuedFraction {
     numerator_addend: i64,
     denominator: i64,
 }
+
 impl ContinuedFraction {
     pub fn new(num: i64) -> ContinuedFraction {
         ContinuedFraction {
@@ -19,6 +20,7 @@ impl ContinuedFraction {
         }
     }
 }
+
 impl Iterator for ContinuedFraction {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/cubes.rs

@@ -7,6 +7,7 @@ pub struct Cubes {
     offset: i64,
     num: i64,
 }
+
 impl Cubes {
     pub fn new() -> Cubes {
         Cubes {
@@ -16,6 +17,7 @@ impl Cubes {
         }
     }
 }
+
 impl Iterator for Cubes {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/digits.rs

@@ -3,11 +3,13 @@
 pub struct Digits {
     num: i64,
 }
+
 impl Digits {
     pub fn new(num: i64) -> Digits {
         Digits { num }
     }
 }
+
 impl Iterator for Digits {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/divisors.rs

@@ -8,6 +8,7 @@ pub struct Divisors {
     current: i64,
     other: i64,
 }
+
 impl Divisors {
     pub fn new(dividend: i64) -> Divisors {
         Divisors {
@@ -18,6 +19,7 @@ impl Divisors {
         }
     }
 }
+
 impl Iterator for Divisors {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/fibonacci.rs

@@ -3,11 +3,13 @@ pub struct Fibonacci {
     a: i64,
     b: i64,
 }
+
 impl Fibonacci {
     pub fn new(a: i64, b: i64) -> Fibonacci {
         Fibonacci { a, b }
     }
 }
+
 impl Iterator for Fibonacci {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/polygonal.rs

@@ -5,6 +5,7 @@ pub struct Polygonal {
     offset: i64,
     num: i64,
 }
+
 impl Polygonal {
     pub fn new(sides: i64) -> Polygonal {
         Polygonal {
@@ -13,6 +14,7 @@ impl Polygonal {
             num: 0,
         }
     }
+
     /// Find the index at which the given number would appear in a sequence of
     /// polygonal numbers.
     ///
@@ -39,6 +41,7 @@ impl Polygonal {
         }
     }
 }
+
 impl Iterator for Polygonal {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/potential_primes.rs

@@ -5,6 +5,7 @@ pub struct PotentialPrimes {
     num: i64,
     offset: std::iter::Cycle<std::array::IntoIter<i64, 8>>,
 }
+
 impl PotentialPrimes {
     pub fn new(limit: i64) -> PotentialPrimes {
         PotentialPrimes {
@@ -14,6 +15,7 @@ impl PotentialPrimes {
         }
     }
 }
+
 impl Iterator for PotentialPrimes {
     type Item = i64;
     fn next(&mut self) -> Option<i64> {

src/utils/iterators/prime_divisors.rs

@@ -8,6 +8,7 @@ pub struct PrimeDivisors {
     potential_primes: utils::PotentialPrimes,
     num: i64,
 }
+
 impl PrimeDivisors {
     pub fn new(num: i64) -> PrimeDivisors {
         PrimeDivisors {
@@ -16,6 +17,7 @@ impl PrimeDivisors {
         }
     }
 }
+
 impl Iterator for PrimeDivisors {
     type Item = (i64, u32);
     fn next(&mut self) -> Option<(i64, u32)> {

src/utils/iterators/pythagorean_triplets.rs

@@ -8,6 +8,7 @@ pub struct PythagoreanTriplets {
     m_ub: i64,
     m: i64,
 }
+
 impl PythagoreanTriplets {
     pub fn new(perimeter: i64) -> PythagoreanTriplets {
         let semiperimeter = perimeter / 2;
@@ -20,6 +21,7 @@ impl PythagoreanTriplets {
         }
     }
 }
+
 impl Iterator for PythagoreanTriplets {
     type Item = (i64, i64, i64);
     fn next(&mut self) -> Option<(i64, i64, i64)> {