add duration to string function

src/lib.rs

@@ -4,3 +4,4 @@ pub mod grid;
 pub mod math;
 pub mod number;
 pub mod permutation;
+pub mod time;

src/time.rs

@@ -0,0 +1,27 @@
+use std::time::Duration;
+
+pub fn get_elapsed_string(duration: Duration) -> String {
+    let total_microseconds = duration.as_micros();
+    let total_milliseconds = duration.as_millis();
+    let seconds = duration.as_secs() % 60;
+    let minutes = (duration.as_secs() / 60) % 60;
+    let milliseconds = total_milliseconds % 1000;
+    let microseconds = total_microseconds % 1_000;
+
+    let mut parts = vec![];
+
+    if minutes > 0 {
+        parts.push(format!("{}m", minutes));
+    }
+    if seconds > 0 {
+        parts.push(format!("{}s", seconds));
+    }
+    if milliseconds > 0 {
+        parts.push(format!("{}ms", milliseconds));
+    }
+    if microseconds > 0 {
+        parts.push(format!("{}µs", microseconds));
+    }
+
+    parts.join(" ")
+}