Add function removeTrailingZeros() to NumUtil.

README-EN.md

@@ -179,6 +179,7 @@ lessThan                    : < .
 thanOrEqual                 : <= .
 greaterThan                 : > .
 greaterOrEqual              : >= .
+removeTrailingZeros         : get string By value double, and remove redundant trailing zeros.
 ```
 
 * ObjectUtil -> [Example](https://github.com/Sky24n/flutter_wanandroid/blob/master/lib/demos/object_util_page.dart)

README.md

@@ -180,6 +180,7 @@ lessThan                    : < .
 thanOrEqual                 : <= .
 greaterThan                 : > .
 greaterOrEqual              : >= .
+removeTrailingZeros         : double转数字字符串，并移除末尾多余的0.
 ```
 
 * ObjectUtil -> [Example](https://github.com/Sky24n/flutter_wanandroid/blob/master/lib/demos/object_util_page.dart)

lib/src/num_util.dart

@@ -158,4 +158,22 @@ class NumUtil {
   static bool greaterOrEqualDecStr(String a, String b) {
     return Decimal.parse(a) >= Decimal.parse(b);
   }
+
+  /// Remove trailing zeros of double number.
+  static String removeTrailingZeros(double number) {
+    if (number == null) {
+      return null;
+    }
+
+    if (number.truncateToDouble() == number) {
+      return number.toStringAsFixed(0);
+    }
+
+    final value = number.toString();
+    int index = value.length;
+
+    while (value[--index] == '0') {}
+
+    return number.toStringAsFixed(index - value.indexOf('.'));
+  }
 }