Rooting android version 5.1 lollipop now has Been a great war no specified app has been designated rooting them.Kingroot latest version also tried a little bit but was unable to root all lollipop 5.1
Did you have camon c8 and you are willing to root it? This post is for you I will indulge you to pay attention to my steps.

How to root techno camon C8
All credit goes to Hovatek for producing us with TWRP for the camon c8 users.
Things needed
1. PC window 7/8
2. Sp flash tools
3. Twrp recovery mode

•  Download UpdateSu.zip you can copy that to the root of your memory card.
• Download TWRP recovery for camon c8 by Hovatek here
• Flash the TWRP through sp flash tools use this guide here
• Once the flashing is done,boot to recovery mode my holding the power button and the vol+ simultaneously.
• Now click install zip from SD card then navigate to the root of sdcard where you saved UpdateSu.zip
• Click on it wait till the process finish loading then reboot your phone.
• Congratulations, you just rooted your camon c8 you will see SuperSU app installed on your phone.
• To be sure, download root checker from playstore