Feature/math util (#22)

Development supports the math package

mathUtil/floor.go

@@ -0,0 +1,17 @@
+package mathUtil
+
+import (
+	"math"
+	"reflect"
+)
+
+// Floor 对float数据向下取整
+func Floor[T float32 | float64](num T) int {
+	switch reflect.ValueOf(num).Kind() {
+	case reflect.Float32:
+		return int(math.Floor(float64(num)))
+	case reflect.Float64:
+		return int(math.Floor(float64(num)))
+	}
+	return 0
+}