add new solutions

solutions/0/q71/solution.go

@@ -0,0 +1,32 @@
+package q71
+
+import "strings"
+
+func simplifyPath(path string) string {
+	b := strings.Builder{}
+	fields := strings.FieldsFunc(path, func(r rune) bool { return r == '/' })
+
+	p := 0
+	for i := range fields {
+		switch fields[i] {
+		case ".":
+			continue
+		case "..":
+			p = max(p-1, 0)
+		default:
+			fields[p] = fields[i]
+			p++
+		}
+	}
+	for i := range p {
+		b.WriteByte('/')
+		b.WriteString(fields[i])
+	}
+
+	if p == 0 {
+		return "/"
+	}
+	return b.String()
+}
+
+var _ = simplifyPath