good practice 🤣

Author: majcn

src/majcn/math.rs

@@ -0,0 +1,119 @@
+pub trait DigitCounter {
+    fn count_digits(self) -> usize;
+}
+
+impl DigitCounter for u32 {
+    fn count_digits(self) -> usize {
+        if self < 10 {
+            return 1;
+        }
+
+        if self < 100 {
+            return 2;
+        }
+
+        if self < 1000 {
+            return 3;
+        }
+
+        if self < 10000 {
+            return 4;
+        }
+
+        if self < 100000 {
+            return 5;
+        }
+
+        if self < 1000000 {
+            return 6;
+        }
+
+        if self < 10000000 {
+            return 7;
+        }
+
+        if self < 100000000 {
+            return 8;
+        }
+
+        9
+    }
+}
+
+impl DigitCounter for u64 {
+    fn count_digits(self) -> usize {
+        if self < 10 {
+            return 1;
+        }
+
+        if self < 100 {
+            return 2;
+        }
+
+        if self < 1000 {
+            return 3;
+        }
+
+        if self < 10000 {
+            return 4;
+        }
+
+        if self < 100000 {
+            return 5;
+        }
+
+        if self < 1000000 {
+            return 6;
+        }
+
+        if self < 10000000 {
+            return 7;
+        }
+
+        if self < 100000000 {
+            return 8;
+        }
+
+        if self < 1000000000 {
+            return 9;
+        }
+
+        if self < 10000000000 {
+            return 10;
+        }
+
+        if self < 100000000000 {
+            return 11;
+        }
+
+        if self < 1000000000000 {
+            return 12;
+        }
+
+        if self < 10000000000000 {
+            return 13;
+        }
+
+        if self < 100000000000000 {
+            return 14;
+        }
+
+        if self < 1000000000000000 {
+            return 15;
+        }
+
+        if self < 10000000000000000 {
+            return 16;
+        }
+
+        if self < 100000000000000000 {
+            return 17;
+        }
+
+        if self < 1000000000000000000 {
+            return 18;
+        }
+
+        19
+    }
+}

src/majcn/mod.rs

@@ -1 +1,2 @@
 pub mod bignumbers;
+pub mod math;