splited big file into smaller files by functionality

find.go

@@ -0,0 +1,16 @@
+package interval
+
+func (intvls *intervals) FindIntervalsForValue(value int) []*Interval {
+	intvls.Sort()
+	var matches []*Interval
+	for _, intvl := range intvls.Intervals {
+		if intvl.Low > value {
+			// due to the intervals are sorted, we can confirm that we will not find more matches
+			break
+		}
+		if inBetweenInclusive(value, intvl.Low, intvl.High) {
+			matches = append(matches, intvl)
+		}
+	}
+	return matches
+}