feat: 1694. Reformat Phone Number

leetcode/1694/1694. Reformat Phone Number.go

@@ -0,0 +1,51 @@
+package _694
+
+import (
+	"bytes"
+	"strings"
+)
+
+func reformatNumber(number string) string {
+	number = strings.Replace(number, " ", "", -1)
+	number = strings.Replace(number, "-", "", -1)
+
+	var res bytes.Buffer
+
+	if len(number)%3 == 1 { // 最后是 xx-xx
+		for i := 0; i < len(number)-4; i++ {
+			if i%3 == 0 && i != 0 {
+				res.WriteByte('-')
+			}
+			res.WriteByte(number[i])
+		}
+		if len(res.String()) > 0 {
+			res.WriteByte('-')
+		}
+		res.WriteString(number[len(number)-4 : len(number)-2])
+		res.WriteByte('-')
+		res.WriteString(number[len(number)-2:])
+		return res.String()
+	}
+	if len(number)%3 == 2 { // 最后是 xx
+		for i := 0; i < len(number)-2; i++ {
+			if i%3 == 0 && i != 0 {
+				res.WriteByte('-')
+			}
+			res.WriteByte(number[i])
+		}
+		if len(res.String()) > 0 {
+			res.WriteByte('-')
+		}
+		res.WriteString(number[len(number)-2:])
+		return res.String()
+	}
+
+	for i := 0; i < len(number); i++ {
+		if i%3 == 0 && i != 0 {
+			res.WriteByte('-')
+		}
+		res.WriteByte(number[i])
+	}
+
+	return res.String()
+}

leetcode/1694/1694. Reformat Phone Number_test.go

@@ -0,0 +1,27 @@
+package _694
+
+import "testing"
+
+func Test_reformatNumber(t *testing.T) {
+	type args struct {
+		number string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "one",
+			args: args{number: "1-23-45 6"},
+			want: "123-456",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := reformatNumber(tt.args.number); got != tt.want {
+				t.Errorf("reformatNumber() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

leetcode/1694/solution1/solution1.go

@@ -0,0 +1,21 @@
+package solution1
+
+import "strings"
+
+func reformatNumber(number string) string {
+	number = strings.ReplaceAll(strings.ReplaceAll(number, "-", ""), " ", "")
+	var format func(sub string) string
+	format = func(sub string) string {
+		if len(sub) == 2 {
+			return sub
+		}
+		if len(sub) == 3 {
+			return sub
+		}
+		if len(sub) == 4 {
+			return sub[:2] + "-" + sub[2:]
+		}
+		return sub[:3] + "-" + format(sub[3:])
+	}
+	return format(number)
+}